MOLLUSCA AND SHELLS. 7 
Fig. 174. Ceriruium cmiatum, lateral view of the shell, with 
the animal, enlarged ; 174 a, ventral view of the shell, with the 
animal, enlarged ; 174 6, locomotive disk, enlarged; 174 ¢, natural 
size of the shell; 174 d, the operculum, magnified. —p. 148. 
Fig. 175. Crriruium FiLosum, ventral view of the shell, en- 
larged ; 175 a, dorsal view of the same; 175 8, details of sculp- 
ture, magnified ; 175 ¢, natural size.—p. 149. 
PLAL Hit: 
Fig. 176. PELEx LATERALIS, ventral view of the shell, enlarged; 
176 a, and 176 4, lateral and dorsal views of the shell, enlarged ; 
176¢, natural size. [Latia neritoides, Gray, Zool. Proc. 1849, p. 
168. Crepidula neritoides, Recluz, in Journ. Conchyliol. 1851, p. 
200, pl. 6, f. 16, 17; Menke’s Zeitsch. 1852, p. 182.]—p. 153. 
Fig. 177. Naviceyta Freycinet (?), lateral, and 177 a, ventral 
views of the animal; 177 }, 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. NerivTINA GRANOSA, view of the animal, as seen from 
below.—p. 161. 
Fig. 180. Neritiva LAMARcKI, ventral view of the animal, in 
the shell.—p. 162. 
Fig. 181. Neritixa Tairensis, the animal, as seen from beneath, 
in the shell.—p. 161. 
Fig. 182. NeritiInA CANALIS, the animal, seen laterally ; 182 a, 
ventral view of the animal.—p. 161. 
Fig. 183. Neritina Gacates, lateral view of the shell, with the 
animal.—p. 163. 
Fig. 184. Neririna 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. Neririna ruGINOSA, head of the animal, enlarged; 
186 a, outline of the shell of an adult specimen.—p. 164. 
Fig. 187. NerivinA CHOLERICA, lateral view of the shell, with 
the animal; 187 a, ventral view of the animal; 187 4, 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. Nerivina carrra, lateral view of the shell, with the 
animal.—p. 164. 
Fig. 190. NertvINA SIDEREA, ventral, and 190 a, dorsal view of 
the shell, enlarged ; 190 4, natural size.—p. 160. 
Fig. 191. Neririva porcata, ventral view of the shell; 191 a, 
dorsal view of the shell.—p. 157. 
Fig. 192. Nerrriva AMa@NA, dorsal, and 192 a, ventral views of 
the shell, enlarged ; 192 6, natural size.—p. 159. 
Fig. 193. Neriviva unpata, lateral view of the shell, with the 
animal.—p. 163. 
Fig. 194. Nerrra ALBICILLA, lateral view of the shell, with the 
animal; 194 a, ventral view of the same.—p. 167. 
Fig. 195. Nerira crassa, dorsal view of the shell; 195 a, ven- 
tral view of the shell.—p. 166. 
Fig. 196. Nerira unpaAta, lateral view of the animal, and the 
dark variety of the shell, as in motion; 1964, the same, as seen 
from beneath.—p. 167. 
Fig. 197. Nerira mustva, ventral view of the shell; 197 a, the 
back of the shell.—p. 165. 
PLATE 12. 
Fig. 198. Turbo setosus, lateral view of the shell, with the 
’ 
+ asa Beles Ie — 
animal, as in motion; 198 a, locomotive disk, and under side of 
head; 198 4, head and tentacles, viewed from beneath, in outline; 
198 ¢, tentacle and leaflet, enlarged.—p. 169. 
Fig. 199. Turso ArGyRostomus, the shell, with the animal, as 
in motion; 199 a, head and tentacles of the animal, in outline, 
seen from below; 199 4, tentacle and eye, with its leaflet, enlarged. 
—p. 170. 
Fig. 200. Turzso sParventus, lateral view of the shell and ani- 
mal, as in motion.—p. 170. 
Fig. 201. Turso PETHOLATUS, shell, in outline, with the animal, 
as in motion; 201 a, the locomotive disk.—p. 171. 
Fig. 202. Turso conrracosus, lateral view of the shell and ani- 
mal; 202 a, the animal, seen from below; 202 6, ventral view of 
the shell.—p. 171. 
Fig. 203. Turzo strius, lateral view of the shell; 205 a, basal 
view of the shell; 203 6, details of the sculpture of the base, mag- 
nified ; 203 c, two sides of the operculum.—p. 173. 
Fig. 204. Turso LACINIATUS, profile view of the shell, a young 
specimen ; 204 a, base of the shell; 204 0, details of sculpture, 
magnified ; 204 e, 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. Trocuus pruNINUS, ventral view of the shell; 205 a, 
dorsal view of the shell; 205 4, details of sculpture, magnified.— 
p- 180. 
Fig. 206. Trocuus TEXTURATUS, ventral view of the shell ; 206 a, 
dorsal view of the shell; 206 6, sculpture of the spire, magnified. 
—p. 181. 
Fig. 207. Trocuus LIGATUS, ventral view of the shell; 207 a, 
base of the shell; 207 6, sculpture of a portion of the base, magni- 
fied.—p. 185. 
Fig. 208. TRrocnus PuPILLUws, the shell, in profile; 208 a, base of 
the shell; 208 6, sculpture of the whorls, and 208 ¢, sculpture of 
the base, magnified.—p. 186. 
Fig. 209. Trocuus sucunpus, profile view of the shell; 209 a, 
base of the shell; 209 4, portion of the surface, magnified.—p. 
Lit 
Fig. 210. Trocius GrApAtus, ventral view of the shell; 210 a, 
dorsal view; 210, portion of the base, magnified, to show the 
sculpture ; 210 c, sculpture of the side, magnified.—p. 175. 
PLATE 18. 
Fig. 211. Trocuus Arer, shell, with the animal, as in motion. 
—p. 182. 
Fig. 212. Trocuus nicer, shell, with the animal, as in motion; 
212 a, the same, seen from below.—p. 171. 
Fig. 213. Trocuus Aravcanus, shell, with the animal, as in 
progression.—p. 182. 
Fig. 214. Trocuus 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%, natural size,— 
p. 184. 
Fig. 216. Trocuus E1isus, profile view of the shell; 216 a, por- 
tion of the base of the shell, enlarged ; 216 4, base of the shell : 
216 c, details of sculpture, magnified.—p. 178. 
Fig. 217. Trocuus Acrnosus, profile view of the shell; 217 a, 
base of the shell; 217 6, sculpture of the side, and 217 c, sculp- 
ture of the base, magnified.—p. 179. 
Fig. 218. Trocuus Amanvs, profile of the shell; 218 a, base of 
