292 Explanation of Plates. 
Figure 7.—Pleurotomella Packardii V., p. 265. Dorsal view of the anterior part of 
the animal from an alcoholic specimen, male; enlarged about 4 diameters. 
Figure 8.—Taranis pulchella V., p. 267. Front view of the largest specimen taken ; 
x 8 diameters. 
Figure 9.—Choristes elegans Carp., var. tenera V., p. 256. Top view of a very young 
specimen; much enlarged. 
Figure 9a.—The same. Top view of a somewhat older specimen, enlarged to the same 
extent. = 
Figure 9b.—The same. Basal view of a still older specimen, enlarged the same. 
Figure 10.—Addisonia paradoxa Dall, p. 256. Part of the odontophore; much en- 
larged. 
Figure 11.—The same. Side view; x 2 diameters. 
Figure 1la.—Dorsal view of the same specimen; x 2 diameters. 
Figure 11b.—The same. Ventral view of the animal and shell of a larger specimen 
in alcohol; x 2 diameters. : 
Figure 12.—Cocculina Beanii Dall, p. 271, Side view; x 8 diameters. 
Figure 13.—Fissurella Tanneri V., p. 255. Type specimen. Top view; natural size. 
Figure 13a.—The same specimen, side view. 
Figure 14.—WMargarita regalis V. and 8., p. 254. Part of one side of the odontophore ; 
much enlarged. 
Figure 15.—Cylichna Dalli V., p. 274. Type specimen. Front view; x 4 diameters. 
Figure 16.—WMangilia cerina V., p. 250. View of a portion of the shell and extended 
animal from a living specimen; enlarged about 8 diameters. 
Figure 16a.—The same. Dorsal view of the head and front part of the foot, more 
extended. 
PLATE XXX. 
Figure 1.—Placophora Atlantica V. and §., p. 206. Ventral view of the type speci- 
men; natural size. 
Figure 1a.—Dorsal view of the same specimen. 
Figure 1b.—The same. Detached valves; a, dorsal side of the anterior valve; 3, 
ventral side of the same valve; c, dorsal side of one of the middle valves; d, 
dorsal side of the posterior valve, and e, ventral side of the same valve; x 2 
diameters. 
Figure 2.—Trachydermon exaratus (Sars), p. 208. Dorsal view; x 2 diameters. 
Figure 2a.—Ventral view of the same specimen. 
Figure 26.—The detached anterior valve of the same specimen; a, dorsal side; }, 
ventral side; x 4 diameters. 
Figure 3.—Necra lamellosa M. Sars, p. 277. Side view; x10 diameters. 
Figure 4.—Pholadomya arata V. and §., p. 278. Anterior view of a large left valve; 
natural size. 
Figures 5, 6.—The same. View of the beak and hinge of two specimens to show 
variations in the hinge; x 2 diameters. 
Figure 7.—Pecchiolia gemma, vi, p. 258. Type specimen. View of the interior of the 
left valve, x 6 diameters. 
Figure 8.—The same. View of the exterior of the right valve of a larger example. 
Figure 9.— Verticordia celata V., p. 278. Type specimen. View of the exterior; x 8 
diameters. 
Figure 9a.—The same valve, view of the interior; x 8 diameters. 
