MOLLUSCA AND SHELLS. 
the shell, and 218 b, the shell, seen from above, enlarged, 218 c, 
natural size.—p. 187. 
Fig. 219. TRocnus SPURCUS, profile, 219 a, basal, and 219 0, 
superior view of the shell, enlarged; 219 c, natural size.—p. 188. 
Fig. 220. TROCHUS CIRCUMSUTUS, profile view of the shell; 220 
a, base of the shell.—p. 176. 
Fig. 221. TROCHUS BICRENATUS, the shell, in profile; 221 a, base 
of the shell; 221 b, and 221 c, details of sculpture of the side and 
base, magnified.—p. 175. 
Fig. 222. TROCHUS ROTELLINUS, the profile, 222 a, the top, and 
222 b, the base of the shell, enlarged ; 222 c, natural size.—p. 191. 
Fig. 223. TROCHUS COLUBRINUS, a green, brown-spotted speci- 
men; 228 a, a smooth, uniformly green specimen, tinted red be- 
neath, with the animal protruded, 223 5, subcarinate, tessellated 
specimen, with the animal, seen from below ; 223 c, portion of the 
lingual organ, highly magnified.—p. 183. 
Fig. 224. TROCHUS ATRO-PURPUREUS, the shell, seen from above, 
enlarged ; 224 a, shell, with the animal, as in progression ; 224 5, 
shell, with the animal, as seen from beneath; 224 c, details of 
sculpture, magnified; 224 d, natural size; 224 e, base of shell.— 
p. 187. 
Fig. 225. TROCHUS INSTRICTUS, dorsal, and 225 a, ventral views 
of the shell, enlarged; 225 6, details of sculpture, magnified; 225 
c, natural size.—p. 190. à 
Fig. 226. SOLARIUM EGENUM, lateral view of the shell, enlarged, 
226 a, base of the shell, enlarged; 226 b, details of sculpture, 
magnified; 226 c, natural size. —p. 196. 
PLATElS) 14 
Fig. 227. Trocnus (Bembicium) SQUAMIFERUS (?) Koch, shell, 
with the animal, as in progression; 227 a, ventral view of the 
same. —p. 192. 
Fig. 228. MARGARITA MAGELLANICA, shell, with the animal, as 
in crawling, enlarged; 228a, plantar view of the animal and 
shell, enlarged, 228 b, ventral view of the shell, an angular spe- 
cimen, 228 c, the operculum.—p. 192. 
Fig. 229. MARGARITA CONICA, animal, with the shell, as in pro- 
gression, magnified, 229 a, and 229 b, enlarged views of the head 
of the animal, above and beneath ; 229 c, natural size.—p. 194. 
Fig. 280. MARGARITA PERSICA, ventral vievv of the shell, 230 a, 
basal view of the same.—p. 198. 
Fig. 231. LACUNA CARINATA, an elongated specimen of the 
shell; 231 a, ventral view of a short specimen; 231 b, dorsal 
view of the same, in outline.—p. 194. 
Fig. 233. LITTORINA GRANDINOSA, shell, with the animal, as in 
progression ; 233 a, locomotive disk.—p. 203. 
Fig. 234. LITTORINA PYRAMIDALIS, shell, with the animal, as in 
progression; 234 a, locomotive disk. —p. 202. 
Fig. 239. LITTORINA OBESA, shell, with the animal, as in pro- 
gression ; 235 a, ventral view of the animal.—p. 202. 
Fig. 236. LITTORINA PLENA, ventral, and 236 a, dorsal views of 
the shell, enlarged; 236 b, natural size.—p. 201. 
Fig. 237. LITTORINA PATULA, ventral view of the shell; 237 a, 
dorsal view of the shell.—p. 197. 
Fig. 238. LITIORINA LEPIDA, ventral, and 238 a, dorsal views of 
a checked specimen, enlarged; 2380, dorsal view of the white 
variety, enlarged, 238 c, natural size.—p. 199. 
Fig. 239. LITTORINA ACUMINATA, ventral view of a large speci- 
men, magnified; 239 a, dorsal view of a slender specimen, en- 
larged, 239 b, natural size.—p. 200. 
Fig. 240. LITTORINA CALIGINOSA, ventral, and 240 a, dorsal 
views of the shell, enlarged; 240 b, natural size.—p. 198. 
Fig. 241. LITTORINA SCUTULATA, ventral view of the shell; 241 
a, dorsal view of the shell.—p. 200. 
Fig. 242. MELAMPUS MUCRONATUS, dorsal view of the shell, en- 
larged ; 242 a, ventral view of the shell, natural size; 2422, the 
aperture, enlarged.—p. 204. 
Fig. 243, MELAMPUS (spec. indet.), the animal, in progression ; 
248 a, the head, from above. 
Fig. 244. SCALARIA TEXTURATA, ventral view of the shell, en- 
larged ; 244 a, junction of the whorls at the suture, enlarged ; 244 
b, natural size.—p. 206. 
Fig. 245. SCALARIA GRACILENTA, ventral view of the shell, mag- 
nified ; 245 a, natural size; 245 b, details at the suture, magnified. 
—p. 205. 
Fig. 246. STILIFER ACICULA, ventral view of the shell, enlarged ; 
246 a, profile view of the same; 246 b, natural size.—p. 207. 
Fig. 247. STILIFER (2), animal, with an outline of the 
shell, taken from Holothuria, at Taheiti.—p. 208. 
Fig. 248. HALIOTIS CRISPATA, aperture of the shell; 248 a, back 
| of the shell.—p. 209. 
PLATE(14) 15 
Fig. 249. STOMATELLA TUMIDA, ventral view of the shell, 249 a, 
dorsal view of the shell.—p. 209. 
Fig. 250. STOMATELLA DECOLORATA, ventral, and 250 a, dorsal 
views of the shell; 250 5, details of sculpture, magnified.—p. 210. 
Fig. 251. PLANAXIS LINEOLATUS, ventral, and 251 a, dorsal 
views of the shell, enlarged ; 251 b, natural size.—p. 203. 
Fig. 252. LITIOPA DECUSSATA, ventral view of the shell, greatly 
magnified ; 252 a, natural size.—p. 195. 
Fig. 253. Natica Lewisi TN. herculea, Middendorff, Beitrage z. 
einer Malac. Ross. IL, 96, pl. 7, f. 5, 6, 7, anno 1849], ventral 
view of the shell; 253 a, the operculum.—p. 211. 
Fig. 254. NATICA CAURINA, ventral view of the shell; 254 a, 
dorsal view of the same.—p. 212. 
Fig. 255. NATICA DILECTA, ventral, and 255 a, dorsal views of 
the shell.—p. 213. 
Fig. 256. NATICA ALGIDA, ventral, and 256 a, dorsal views of 
the shell.—p. 214. 
Fig. 257. NATICA SOLUTA, ventral, and 257 a, dorsal views of 
the shell.—p. 215. 
Fig. 259. SIGARETUS ANTARCTICUS, dorsal view of the animal, 
259 a, lateral, and 2590, plantar views of the animal; 259 c, 
head, with the proboscis protruded.—p. 216. 
Fig. 260. SIGARETUS PRATENUIS, lateral view of the animal, 
260 a, the dorsal, and 260 b, the plantar views of the animal.— 
p. 217. 
Fig. 261. RISSOA AMBIGUA, ventral, and 261 a, profile views of 
the shell, enlarged; 261 b, the aperture, much enlarged; 261 c, 
natural size.—p. 217. 
Fig. 262. PYRAMIDELLA (spec. indet.), shell, with the animal, as 
in progression; 262 a, animal and shell, viewed from below. 
Fig. 263. TORNATELLA BULLATA, ventral view of the shell, en- 
larged; 263 a, dorsal view of the same; 263 b, natural size.—p. 
218. 
Fig. 264. BULLA BIFASCIATA, dorsal view of the shell, with the 
animal.—p. 220. 
Fig. 265. BULLA DIAPHANA, dorsal view of the animal, with the 
shell; 265 a, the ventral, and 2650, the lateral view of the 
