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longiores, articulo primo longiore, flagello plus duplo longiore quam basis, fere nudo. Antennæ 2dæ dimidium 1marum longitudinem parce superantes, basi longiore quam basis 1marum, flagello brevi (multo breviore quam basis), subulato, infra hirsuto. Manus Ima 2da feminæ subæquæ, parvulæ, breves, apicem rectè truncatæ et non latiores; palmâ apicali, digito, minuto; 2da maris valida, subovata, dorsum rectiuscula, prope apicem internum unidentata, digito longo. Pedes 3tii 4ti subæqui; 5ti 6ti 7mi breviusculi, sensim increscentes, articulo primo lato.

Microcheli, generi non vero, ut mihi videtur, femina A. brevipedis forsan pertinet.

B. ANTENNÆ SUPERIORES BREVIORES. (Genus IPHIMEDIA, Rathke.) 13. IPHIMEDIA SIMPLEX. Corpus compressum, nudum, epimeris latis, quintis angustis. Antennæ 2dæ dimidii corporis longitudine, basi brevi, flagello fere nudo, plus duplo longiore, articulis perbrevibus. Antennæ 1mæ paulo breviores, basi vix breviore quam basis 1marum. Pedes toti breves: manus 1ma mediocris, angusto-ovata, apicem subacuta; 2da (feminæ ?) minor, formam similis. Pedes 3tii 4ti subæqui, 2dis longiores; reliqui 6 subæqui, setis brevissimis, articulo primo latissimo, margine postico obsoletè serrulato.

Long. 4""-5". - Hab. apud oras insulæ "Hermite " Fuegiæ.

14. IPHIMEDIA (ACANTHOSOMA, Owen) NODOSA. - - Corpus crassiusculum, testâ subcalcareâ, fronte minutè rostratâ, abdomine dentatocarinato, segmentis corporis 4 anticis marginem integris, quinto sinuoso, sequentibus plus minus spinoso-dentatis aut acuto-nodosis segmentis quatuor ultimis exceptis; epimeris tribus anticis integris, obtusis, 4tis latis, posticè 2-dentatis, tribus sequentibus angustis, posticè acutis. Articulus primus pedum posticorum grandis, subquadratus postice uni-dentatus, angulum posticum acutus. Antennæ 2dæ dimidio corporis breviores, nude; 1mæ paulo breviores. Pedes nudi; 4 antici (feminæ ?) parvuli, manubus minutis subæquis; 6 postici subæqui, articulo tertio triangulato, apice postico producto et acuto. Long. 4.- Hab. apud oras insulæ "Hermite " Fuegiæ.

Genus III. EDICERUS. (Kröyer.)

Amphitoe pedes 4 anticos membraque buccalia affinis. Pedes septimi valde elongati, tenues, fere filiformes. Epimera mediocria.

EDICERUS NOVI-ZEALANDIÆ.

VOL. II.

- Parvulus. Antennæ 1mæ dimidio

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corporis breviores, teretes, articulis oblongis ; 2dæ fere duplo longiores, flagello fermè 21-articulato, fere duplo longiore quam basis. Pedes 7mi corporis longitudine, extremitate styliformi, minutè pubescente : 4 antici inæqui, manubus ovatis, manu 1mâ parvulâ, 2dâ validiusculâ, palmâ paulo excavatâ, digito sat longo, Pedes 3tii 4ti tenues, parvuli; sequentes articulum primum angusti.

Long. 2. — Hab. in sinu " Bay of Islands" Novi-Zealandiæ.

Genus IV. ERICHTHONIUS? (M. Edwards.)

Antenna elongata. Pedes primi plus minusve cheliformes, secundi valde cheliformes, digito biarticulato, pollice prominente. Epimera sat angusta aut latiuscula. Cauda subsaltatoria.

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Erichthonii gressorii (caudâ non saltatoriâ), M. Edwardsio auctoritate, et epimera carentes. Forsan genus hic descriptum Erichthonio discrepat et novum. Hoc credente, genus Pyctilus (a TúкTηs, pugil) in manuscriptis auctore institutum est.

1. ERICHTHONIUS (PYCTILUS?) MACRODACTYLUS.-Corpus gracilis, epimeris mediocribus, capite oblongo, margine frontis ophthalmico producto. Antennæ elongatæ; 2dæ corpore breviores, articulis 3tio 4toque subæquis, longis, flagello paulo breviore quam basis, fermè 10-articulato, setis perbrevibus. Manus 1ma elliptica, 2-articulata, (articulo primo majore) digito brevi. Manus 2da validissima, paulo < forma, pollice prælongo, acuto, digito longiore quam manus, articulis duobus subæquis, utroque pollicis longitudinem æquante, apicem acuto, sparsim breviter hirsuto. Pedes 3tii 4ti subæqui; 5ti breves, articulo primo posticè acutè producto; 6ti 7mi paulo inæqui, postici longiores. Hab. in mari Indiæ Orientalis.

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2. ERICHTHONIUS (PYCTILUS?) PUGNAX. Antennarum basis 1marum flagello vix longior. Manus secunda validissima oblonga, marginibus antico posticoque fere parallelis, pollice brevi, bifurcato; digito elongato, articulis duobus inæquis primo crassiore et longiore, intus parce eroso et sparsim hirsutiusculo, duplo longiore quam pollex. Hab. in mari India Orientalis.

Familia III. COROPHIDE.

Corpus plus minusve depressum, lineare, abdomine recto, articulos normali, epimeris angustissimis vel obsoletis. Mandibulæ palpigeræ. Antenna pediformes. Animalia gressoria.

Genus I. COROPHIUM.

Pedes secundi non subcheliformes digito nullo 2-articulato. Antennæ 2dæ flagellis carentes.

COROPHIUM QUADRICEPS.-Caput quadratum. Abdomen postice rotundatum. Pedes 4 antici similes, primis minoribus. Pedes 5ti 4tis breviores, articulo primo non setoso; 7mi tenues, articulo primo setoso, setis longiusculis, plumosis. Antennæ (an adultæ ?) subæquæ ; 1mæ parce breviores, 7-articulatæ, articulo primo longiore; 2dæ crassiusculæ, 7-articulatæ, quartam partem corporis longitudine vix superantes, articulo 3tio longiore, tribus ultimis parvulis subæquis.

Long. 1"". Hab. in portu " Rio de Janeiro."

Genus II. CLYDONIA. (Dana.) »

Corpus elongatum, paulo depressum.

Abdomen 6-7-articulatum.

Antennæ quatuor; duæ elongatæ, styliformes, recta et rigidæ, articulo basali brevi, reliquâ parte longissimè subulatâ obsoletè multi-articulatâ. Pedes tenues, 6 postici longè filiformes, quintis longissimis.

1. CLYDONIA GRACILIS. - Antennæ longæ fere corporis longitudine, subulatæ. Oculi parvi, lenticulis 9. Styli caudales tenues, 1mi 3tiique 2dis longiores, 3tiis ramum brevem acutum ad medium ferentibus. Pedes 5ti corpore non breviores, articulo primo longissimo infra minutè spinoso, apice spinoso-producto; 7mi 5tis plus dimidio breviores. Abdominis segmenta 3 antica latere acuta, angulo postico sub

truncato.

Long. 3"". Hab. in mari Atlantico, lat. bor. 1°, long. occ. 18°. Lect. die 31 Oct., 1838.

2. CLYDONIA LONGIPES.- C. gracili similis. Antennæ longæ fere corporis longitudine, subulatæ, parce crassiores. Pedes 7mi 5tis non dimidio breviores. Segmenta abdominis duo antica angulos posticos

acuta et non truncata.

Long. 4-5.- Hab. in mari Pacifico, lat. aust. 18° 10′, long. occ. 126°. - Lect. die 8 Aug., 1839.

Familia IV. ICILIDE.

Corpus valde compressum, latum, vix lineare, abdomine articulos normali, valde inflexo. Pedes plerumque latè expansi instar Aranei,

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Antennæ quatuor flagellis confectæ, non pediformes. Animalia gressoria.

Genus ICILIUS.

Antenna elongatæ, secundæ longiores. Pedes non prehensiles, toti vergiformes, apicem unguiculati. Styli caudales sex, furcati.

ICILIUS OVALIS.Cephalothorax ellipticus, capite brevi latè triangulato, frontem lateraque obtuso. Oculi remotissimi. Segmentum thoracis primum angustius et brevissimum. Abdomen 7-articulatum, segmentis tribus anticis ad marginem posticum medianum acutis, segmento ultimo parvulo ovato. Antennæ subteretes: 2da corpore longiores, flagello fere duplo longiore quam basis, tenuissimo: 1mæ fere dimidio breviores, flagello non duplo longiore quam basis. Pedes 4 antici infra densè hirsuti; 6 postici inter sese similes; 7mi 6tis valde longiores, tenues, fere nudi.

Long. 2.

Hab. in freto "Balabac," juxta Borneo.

Three hundred and twenty-eighth meeting.

February 13, 1850.-QUARTERLY MEETING.

[This statute meeting was held in virtue of an adjournment from January 30th, on account of the accidental omission of the usual circular notice to the Fellows.]

The PRESIDENT in the chair.

Professor Guyot, from the committee on the resolutions in behalf of the establishment of a system of meteorological observations in the State of Massachusetts, reported in favor of their adoption. The report was accepted, and the resolutions adopted.

Professor Peirce, Professor Guyot, and Dr. H. I. Bowditch were appointed a committee to bring the subject to the consideration of the Legislature now in session.

The Librarian brought to the notice of the Academy a chart of the ancient mounds, or earth-works, at Marietta, by Winthrop Sargeant, addressed in the year 1788 to Governor Bowdoin, President of the Academy. The Librarian found

this among the manuscript papers in his custody, and considers it as very interesting from its being an earlier survey than that which is published in the first volume of the Smithsonian Contributions to Knowledge, with which it corresponds in most particulars, while it exhibits some parts which do not appear in the later chart, showing that some changes may have taken place during the interval.

Mr. Desor made some remarks on the columnar crystallization of ice in gravel or clay, and offered an explanation of the phenomenon, differing in some respects from that of a writer in a late number of Jameson's Journal.

Further remarks on the subject were made by Professor Rogers, Dr. C. T. Jackson, Mr. Treadwell, and others.

Dr. C. T. Jackson, from the committee on coast marks, submitted the following report:

"The committee appointed to consider the subject of permanent coast marks for the determination of the future changes of level of the coast of the United States, have attended to their duty, and beg leave to present the following report.

"It is now more than a century since the great Swedish philosopher, Celsius, announced that, from observations made on the coast of Sweden, he had arrived at the conclusion that the relative level of the land and sea was not fixed, but that undoubted changes took place, which he, at that time, ascribed to the subsidence of the waters of the Baltic Sea.

"It was not until the beginning of this century, that it was discovered that the change, instead of being the result of a subsidence of the waters, was due, on the contrary, to a gradual rise of the land. The bearing of this discovery was too obvious to be overlooked. It not only afforded the means of explaining many geological phenomena, but it seemed also to involve the future destinies of all coasts undergoing similar changes. Surveys, accordingly, were ordered by the Swedish government, as long ago as the year 1820, to discover the amount of change in a given time; and we are already in possession of records, which enable us to estimate with accuracy the amount of upheaval in many places.

"The example set by the Swedish government has been followed

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