Cottus cognatus, 189.

Fabricii, 189.
Franklinii, 189.

gobioides, 189,

gracilis, 189.

meridionalis, 189.

Richardsonii, 189.

variabilis, 77, 165, 182, 187, 312.
viscosus, 189.

Crow, American, distinct species, 104.
Crystals, in nervous system of Frogs,
53, 54.

Cucumaria fusiformis, 67.
Cyamus ceti, 89.
Cyclas egregia, 292.

patella, 292.

Cylindrella jejuna, 41.

pontifica, 40.

Cypricardia rosea, 276.
Cyrena debilis, 293.

Dasya plumosa, 371.
Dendritic forms, 99.
Dendrocœlum pulcherrimum, 265.
superbum, 265.

DESOR, E. On Hydroidian Polyps, 65–
On Echinoderms, 67-On Drift fossils,
from Nantucket, 79- On the parallel-
ism of American mountain chains, 380.
Dyctyota bidentata, 373.

Dinornis giganteus, 4.
Dodo, 11, 15.

Donation of Jonathan Phillips, 204.
Donax crocatus, 255.

pallidus, 254.

tinctus, 255.

Doris, 191.

Drift deposits, 183, 235, 242, 291.
fossils, from Nantucket, 79.

of the Mississippi, 242.
scratches, 28.

Dugesia, gen. 265.

gonocephaloides, 265.
Dune sand, fresh water in, 92, 94, 103.

Echinarachnius parma, 67.
Echinaster, from Boston Harbor, 11.
Echinocyamus minimus, 367.
Echinoderms, 67.

water tubes in, 349.
Echinometra nigrina, 366.
Echinopsis, 364.

Echinus granulatus, 67.

Ectocarpus hamulosus, 372.

Elevation of coasts, 374, 375.

Embryo Starfish, 13, 17.

Embryological structure of the feet of
birds, 42.

Embryology of Uria troile, 327.

Emysaurus serpentina, 321.

Ephyra, 138.

Epithelial tissues, 166.

Erycina quadrata, 252.

ovata, 218.

On the genus Cot-
tus, 183, 302.- On the Biogen liquid,
239. Ón marine Planariæ, 251, 264,
363.On Planocera elliptica, 348.
Glaciers, structure of, 122, 125.
Glandina bullata, 64.

-

Gold, of California, long known, 287.
crystals, from California, 266, 280.
in Vermont, 382.
Goniometer, reflecting, 78.
GOULD, A. A. On shells from the South-
western States, 37.- Descriptions of
new shells, 64. - On shells of United
States Exploring Expedition, 73, 83,
89, 106, 118, 140, 151, 169, 214, 252,
276, 292, 309, 343. On shells from
Africa, 193.
Gracilaria filiformis, 372.
Green sand, origin of, 248.
of England, 256.

Gun-cotton, 30.

-

Gymnogongrus dendroides, 372.

Hæmatin, crystals of, 313.
Hæmatorhoea, 191.

Hibernation of insects, 68.

Himalaya fossils, 314, 350, 356, 369.
Humble-bee, generation of, 263.
Hydra, 354.

Hydroidian Polyps, 65.
Hylodes Pickeringii, 63.
Hypriea Coulteri, 371.

Ibis guarauna, 313, 332.
Ördi, 355.

Icebergs, crushing action of, 226.
Iguanodon, 46.

Indian corn, 198.

Infusorial deposits, 16.
Iron, analyses of, 233.

of Lake Superior, 211.
smelting of, 229.

Ixodes, 335.