Fig. 174. CERITHIUM CÆLATUM, lateral view of the shell, with the 
animal, enlarged, 174 a, ventral view of the shell, with the ani- 
mal, enlarged; 174, locomotive disk, enlarged; 174 c, natural 
size of the shell; 174 d, the operculum, magnified.—p. 148. 
Fig. 175. CERITHIUM FILOSUM, ventral view of the shell, enlarged ; 
175 a, dorsal view of the same; 175 5, details of sculpture, mag- 
nified ; 175 c, natural size.—p. 149. 
PER TRES IG 
Fig. 176. PELEX LATERALIS, ventral view of the shell, enlarged, 
176 a, and 176 b, lateral and dorsal views of the shell, enlarged ; 
176 c, natural size. [Latia neritoides, Gray, Zool. Proc. 1849, p. 
168.  Crepidula neritoides, Recluz, in Journ. Conchyliol. 1851, p. 
205, pl. 6, f. 16, 17; Menke's Zeitsch. 1852, p. 182.)—p. 153. 
Fig. 177. NAVICELLA FREYCINETI (2), lateral, and 177 a, ventral 
views of the animal, 177 b, dorsal view of the shell.—p. 155. 
Fig. 178. NAVICELLA PORCELLANA, lateral, and 178 a, ventral 
views of the animal, with the shell.—p. 156. 
Fig. 179. NERITINA GRANOSA, view of the animal, as seen from 
below.—p. 161. 
Fig. 180. NERITINA LAMARCKII, ventral view of the animal, in 
the shell.—p. 162. 
Fig. 181. NERITINA TAITENSIS, the animal, as seen from beneath, 
in the shell.—p. 161. 
Fig. 182. NERITINA CANALIS, the animal, scen laterally ; 182 a, 
ventral view of the animal.—p. 161. | 
Fig. 183. NERITINA GAGATES, lateral view of the shell, with the 
animal.—p. 163. 
Fig. 184. NERITINA CORNEA, lateral view of the shell, with the 
animal; 184 a, locomotive disk of the animal.—p. 163. 
Fig. 185. NERITINA RUGINOSA, the young shell, with the animal, 
as in motion; 185 a, the locomotive disk.—p. 164. 
Fig. 186. NERITINA RUGINOSA, head of the animal, enlarged; 186 
a, outline of the shell of an adult specimen.—p. 164. 
Fig. 187. NERITINA CHOLERICA, lateral view of the shell, with 
the animal; 187 a, ventral view of the animal; 187 b, the aper- 
ture of the shell. —p. 156. 
Fig. 188. NERITINA CHRYSOCOLLA, ventral, and 188 a, dorsal 
views of the shell.—p. 158. 
Fig. 189. NERITINA CAFFRA, lateral view of the shell, with the 
animal. —p. 164. 
Fig. 190. NERITINA SIDEREA, ventral, and 190 a, dorsal view of 
the shell, enlarged; 190 b, natural size. —p. 160. 
Fig. 191. NERITINA PORCATA, ventral view of the shell; 191 a, 
dorsal view of the shell.—p. 157. 
Fig. 192. NERITINA AMENA, dorsal, and 192 a, ventral views of 
the shell, enlarged; 192 b, natural size.—p. 159. 
Fig. 193. NERITINA UNDATA, lateral view of the shell, with the 
animal.—p. 163. 
Fig. 194. NERITA ALBICILLA, lateral view of the shell, with the 
animal; 194 a, ventral view of the same.—p. 167. 
Fig. 195. NERITA CRASSA, dorsal view of the shell; 195 a, ven- 
tral view of the shell.—p. 166. 
Fig. 196. NERITA UNDATA, lateral view of the animal, and the 
dark variety of the shell, as in motion ; 196 a, the same, as scen 
from beneath.—p. 167. 
Fig. 197. NERITA MUSIVA, ventral view of the shell, 197 a, the 
back of the shell.—p. 165. 
PLATE GI) Ja 
2 
Fig. 198. Turbo setosus, lateral view of the shell, with the 
MOLLUSCA AND SHELLS, 
animal, as in motion ; 198 a, locomotive disk, and under side of 
head; 198 0, head and tentacles, viewed from beneath, in outline: 
198 c, tentacle and leaflet, enlarged,—p. 169. 
Fig. 199. TURBO ARGYROSTOMUS, the shell, with the animal, as in 
motion; 199 a, head and tentacles of the animal, in outline, seen 
from below; 199 b, tentacle and eye, with its leaflet, enlarged — 
pi 170. : 
Fig. 200. TurBo SPARVERIUS, lateral view of the shell and ani- 
mal, as in motion.—p. 170. | 
Fig. 201. TURBO PETHOLATUS, shell, in outline, with the animal, 
as in motion; 201 a, the locomotive disk.—p. 171. 
Fig. 202. TURBO CONFRAGOSUS, lateral view of the shell and ani- 
mal; 202 a, the animal, seen from below; 202 b, ventral view of 
the shell.—p. 171. 
Fig. 203. TURBO SIRIUS, lateral view of the shell; 208 a, basal 
view of the shell; 203 b, details of the sculpture of the base, mag- 
nified ; 203 c, two sides of the operculum.—p. 173. 
Fig. 204. TURBO LACINIATUS, profile view of the shell, a young 
specimen; 204 a, base of the shell; 204 b, details of sculpture, 
magnified; 204 c, the operculum.—p. 174. [Specimens three 
inches in diameter, some with a double row of basal spines, and 
an entire modification of the aperture, have been recently re- 
ceived from New Caledonia.] 
Fig. 205. TROCHUS PRUNINUS, ventral view of the shell; 205 a, 
dorsal view of the shell; 205 %, details of sculpture, magnified.— 
p. 180. 
Fig. 206. TROCHUS TEXTURATUS, ventral view of the shell; 206 
a, dorsal view of the shell; 206 5, sculpture of the spire, magnified. 
—p. 181. 
Fig. 207. TROCHUS LIGATUS, ventral view of the shell; 207 a, 
base of the shell, 207 b, sculpture of a portion of the base, magni- 
fied.—p. 185. 
Fig. 208. TROCHUS PUPILLUS, the shell, in profile; 208 a, base of 
the shell, 208 b, sculpture of the whorls, and 208 c, sculpture of 
the base, magnified.—p. 186. 
Fig. 209. Trocnus JUCUNDUS, profile view of the shell; 209 a, 
base of the shell, 209 0, portion of the surface, magnified.—p. 
141; 
Fig. 210. TROCHUS GRADATUS, ventral view of the shell; 210 a, 
dorsal view; 210 0, portion of the base, magnified, to show the 
sculpture; 210 c, sculpture of the side, magnified.—p. 175. 
PLATO h 
Fig. 211. Trocnvus ATER, shell, with the animal, as in motion. 
—p. 182. 
Fig. 212. TROCHUS NIGER, shell, with the animal, as in motion ; 
212 a, the same, seen from below.—p. 171. 
Fig. 213. TROCHUS ARAUCANUS, shell, with the animal, as in 
progression.—p. 182. 
Fig. 214. Trocmus mastus, ventral view of a variety of the 
shell. —p. 183. 
Fig. 215. TRocnus TANTILLUS, dorsal view of the shell, en- 
` larged; 215 a, base of the shell, enlarged; 215.5, natural size. — 
p. 184. Å 
Fig. 216. Trocnus ELISUS, profile view of the shell; 216 a, por- 
tion of the base of the shell, enlarged, 216 b, base of the shell, 
216 c, details of sculpture, magnified.—p. 178. 
Fig. 217. Trocnus ACINOSUS, profile view of the shell; 217 a, 
base of the shell; 217 5, sculpture of the side, and 217 c, sculp- 
ture of the base, magnified.—p. 179. 
Fig. 218. Trocnus AMGNUS, profile of the shell; 218 a, base of 
