2. Lepidoptera calcarata. All that remains of Say's original specimen is the stomachal region of the carapace, with the eyes and rostrum attached. This was found in Charleston harbor; a second specimen has not, as far as I know, been yet obtained.

5. Libinia affinis, Randall, hardly appears to differ from L. dubia, M. Edw. 6. Lissa fissirostra is the name under which Say described this species. Some

of our naturalists regard it as identical with Hyas coarctata of the British coasts. I have had no opportunity of comparing specimens from both shores of the Atlantic, but the American species appears to me to resemble most Hyas aranea, judging from the figure in Herbst's work.

9. Mithrax spinosissimus. The specimen in the collection is of unusual size. Carapace 7 inches in length, as many in breadth, and 3 inches thick; hand and finger 7 inches long, 2 broad; whole length of one of the first pair of feet 13 inches.

12. Pericera cornuta. This specimen has been described by Dr. Randall (Jour. Acad. Nat. Sci., vol. viii., p. 108) as Chorinus armatus. It does not belong to the genus Chorinus, as the orbits of the eyes are not incomplete, as they are in that genus, but embrace the peduncle of the eye on all sides like a tube, allowing no other motion to the eye than that of retraction or protrusion. On comparison, Dr. R.'s description will be found to agree in general with that given by M. Edwards of Pericera cornuta, (Hist. Crust., tome I, p. 335,) and a reference to the figure given in Hughes' Nat. Hist, of Barbadoes, pl. 25, fig. 3, or to Herbst, pl. 59, fig. 6, will complete the proof.

13 and 14. Epialtus Nuttalii and productus Randall appear to be new and well marked species.

22. Pseudocarcinus mercenaria is the Cancer mercenaria of Say, (Jour. Acad. Nat. Sci., vol. I, p. 448,) abundant along our southern coast. It is referred by M. Edwards, with some doubt, to the genus Xantho of Leach, (M. Edw. Hist. Crust., tome I, p. 399,) but I have no hesitation in referring it to his own genus Pseudocarcinus, and am disposed to think that he had it before him when writing his description of Pseudocarcinus ocellatus, (op. cit., p. 409.) His description applies in every particular, but is short. The country of his specimens he says is unknown.

25. Platycarcinus productus, Randall, is a distinct species from the three others known.

28. Trapezia cymodoce. The specimens in the collection agree exactly with Guerin's figure, (Voy. Coq. Crust., pl. 1, fig. 4.) M. Edwards' remarks are very just with regard to the difference between Guerin's Trapezia cymodoce, and the Cancer cymodoce of Herbst.

33. Lupa cribraria. The crab of our southern coast described by Say as Lupa maculata, (J. A. N. S., vol. I, p. 445,) appears, by Edwards' description and figure, (op. cit., tome 1, p. 452, pl. 17, fig. 1,) to be same as Lamarck's Portunus cribrarius, (Anim. sans Vert., tome V., p. 259, and 2me. edit., t. V., p. 476.) Say's paper was read Dec. 1st, 1818, and Lamarck's fifth volume was published, as declared by the title page, in July, 1818, and his name has right of priority, and I have therefore adopted it.

35. Lupa pelagica. This specimen has Say's original label affixed, and is doubtless one of the specimens described by him in the Jour. Acad., vol. I, p. 97. It is not the L. pelagica of M. Edwards, and does not appear to be the young of the L. dicantha common along our coast; but further examination is requisite to determine what claims it has to be considered new.

He refers, through mistake, to pl. 18, fig. 1.

39. Potamia latifrons, Randall, is distinct from Boscia dentata, M. Edw. Potamia, as generic name, ought to take precedence of Boscia.

40. Orthostoma dentata, Randall, forms a genus distinct from the others of the same group.

49. Macrophthalmus compressipes, Randall, is a distinct species, and is the same as the M. podophthalmus figured in the Voyage of the Bonite. Priority of publication must determine which name shall prevail. The text of the work I

have not seen.

53. Grapsus cruentatus. The individuals in the Collection of the Academy, belonging to this species, were erroneously regarded by Dr. Randall as new, and were described by him as G. longipes, in the Journal of the Academy, (vol. viii, p. 125.) It was doubtless a mistaken supposition that they were brought from Surinam, as stated p. 126, and this error probably misled Dr. R.

55. Grapsus rudis, M. Edw., is the same as G. hirtus, Randall, (J. A. N. S., vol. viii, p. 124.) Milne-Edwards' name has priority. With him I regard G. rudis as distinct from G. pictus, though it differs only in the following particulars: the carapace is clothed with numerous but distant transverse lines of hairs; the front is not so perpendicularly turned down; the four lobes of the front are more tuberculous, and the limbs smaller when compared with the body. There is but one specimen in the collection, but that is in good condition.

56 and 57. Pachygrapsus crassipes and P. parallelus appear to be distinct from the described species of the genus Grapsus.

66. Guaia ornata. This is a very distinct and pretty species of the genus Guaia, described by Dr. Randall as Ilia ornata, (J. A. N. S., vol. viii, p. 129,) but it really belongs to the genus to which I have referred it. This error, of confounding the two genera, Ilia and Guaia, has been committed by others besides Dr. R., until specimens really belonging to the genus Ilia fell into their hands, when a distinctive character is at once perceived in the peculiar contorted form of the hands in this genus. For want of attention to this point, Myra fugax and Guaia punctata have been confounded with Ilia punctata, many points in the description of each being common.

68. Ranina dentata. Two fine specimens. Dimensions of largest: carapace 4 inches long, 4 broad; carapace and abdomen extended, 7 inches; breadth of hand, finger excluded, 14 inch, including finger, 2 inches; length of thumb or moveable finger, 1 inch; length of one of the first pair of feet, thumb extended, is 7 inches.

70. Blepharipoda occidentalis, Randall. 'A well marked genus. The individual is a female; abdomen with appendages, first pair of feet cheliform; hence it is near Albunea, but quite distinct.

74. Porcellana sociata, Say. In Say's article (J. A. N. S. vol. i. p. 456) the name of this species is given P. soriata. Say's original specimen is still in the collection of the Academy, but the label could not be found to determine how he wrote the name; there can be but little doubt that the name as printed is a typographical error arising from an imperfection in the manuscript, and that Leach, Desmarest, and Milne Edwards are right in regarding sociata as the true specific name; an imperfectly formed c connected with the preceding letter being easily mistaken for one of the manuscript forms of r. Another example of deviation

с

from the original orthography is furnished by Leach's genus Lupa, but in this case the deviation is unjustifiable. In Leach's article Crustaceology, in the Edinb. Encycl., he uses Lupa throughout, and Desmarest does the same in the Consid. Gen. Crust. Milne Edwards, misled apparently by the orthography of the name in French, Lupée, erroneously uses Lupea in his Hist. Nat. Crust. tom i. p. 445, (text and note), while in the references in the notes in the following pages, he uses Lupa; in his notes to the second edition of Lamarck's Anim. sans Vert. tom. v. p. 473, he gives Leach's genus as Lupea, while in the references to his own work (Hist. Nat. Crust.) on page 476, he uses thrice Lupa, and once Lupea. Lastly, in the Appendix to Leach's own article in Edinb. Encyc., the genus is called Lima!

89. Ibachus antarcticus. One individual marked as "brought from Santa Cruz by R. E. Griffith," agrees with Milne Edwards' character for I. antarcticus, the spine being present on the fifth pair of feet, the absence of which marks his I. Parræ, a native of the Antilles. Is I. Parræ a distinct species ? or is it only imperfectly distinguished by the character he assigns to it?

98. Alpheus dispar, Randall, is hardly distinct from A. brevirostris, M. Edw. 101. Hippolyte gracilipes. The specimen thus labelled was in bad condition, but certainly belongs to the genus Palemon; probably some interchange of labels had taken place.

103. Palemon Gaudichaudii, M. Edw. Two fine specimens of this species of Milne Edwards, first brought from Chili by Gaudichaud.

111. Squilla empusa. The specimen I labelled thus, was said to be brought from the Pacific, and does not perceptibly differ from S. empusa, Say, from the Atlantic coast; if it really came from the Pacific, direct comparison with S. empusa of our Coast ought to be made, which I was not able to do for want of specimens of the latter at hand.

113. Squilla Cerisii. This specimen was brought from the Pacific, and agreed with M. Edward's description of the S. cerisii of Roux, inhabiting the Mediterranean; direct comparison is necessary to determine in what points they really differ. It is more probably the same as S. Lessonii, of Guérin.

There were also some eight or ten undetermined species, and several of Say's original specimens of the lower orders of the Crustacea.

Several of the species described by Dr. Randall were wanting, and have been omitted of course in the preceding catalogue.

Additions and Observations by the Committee.

In cases where the additions are of species in genera already in the collection, the numbers for the genera in Prof. Gibbes' paper are used, while higher numbers are employed for the additional genera.

LXV. STENORHYNCHUS, M. Edw.

116. S. phalangium, Pennant.

LXVI. INACHUS, Fabr.

117. I. Dorsettensis, Leach.

LXVII. MAIA, Lam.

118. M. squinado.
LXVIII. HYAS, Leach.

119. H. coarctata, Leach.
120. H. avanea, Leach.

Making the whole number of genera in the collection seventy-eight, and of species, one hundred and seventy-five.

Macrophthalmus compressipes, Rand., is Gelasimus telescopicus, Owen, Voy. Blossom, pl. 24, fig. 1, and M. podophthalmus, Voy. Bonite, pl. 3, fig. 6, 7. Pachygrapsus parallelus, Rand., is Grapsus Thukuhar, Owen, 1. c., fig. 3. Pagurus decorus, Rand., is P. pictus, Owen, 1. c. fig. 2.

Voyage de la Bonite bears date of 1841, and is posterior to both the others, the Voyage of the Blossom being dated in 1839, and Dr. Randall's paper having been