292 Explanation of Plates. 



Figure t. — Pleurotomdla Packardii Y., p. 265. Dorsal view of the anterior part of 

 the animal from an alcoholic specimen, male ; enlarged about 4 diameters. 



Figure 8. — Taranis imlcUella V., p. 2G7. Front view of the largest specimen taken ; 

 X 8 diameters. 



Figure 9. — Chorisies elegans Carp., var. ieneru V., p. 250. 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 Sh. — The same. Basal view of a still older specimen, enlarged the same. 



Figure 10. — Addisouia paradoxa Dall, p. 256. Part of the odoutophore; much en- 

 larged. 



Figure 11. — The same. Side view; x 2 diameters. 



Figure 1 1 a. — Dorsal view of the same specimen ; x 2 diameters. 



Figure 11&. — The same. Ventral view of the animal and sheh of a larger specimen 

 in alcohol ; x 2 diameters. 



Figure 12. — Cocculina Beanii Dall, p. 2'71. 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. — Margarita regalis V. and S., 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. — Mangilia 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. — Flacophora Atlantica V. and S., p. 206. Ventral view of the type speci- 

 men; natural size. 



Figure la. — Dorsal view of the same specimen. 



Figure \h. — The same. Detached valves; a, dorsal side of the anterior valve; 6, 

 ventral side of the same valve ; c, dorsal side of one of the middle valves ; tZ, 

 dorsal side of the posterior valve, and e, ventral side of the same valve ; x 2 

 diameters. 



Figure 2. — Trachydermon eaiarato (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 ; b, 

 ventral side; x 4 diameters. 



Figure 3. — Necera laiiiellosa M. Sars, p. 277. Side view; x 10 diameters. 



Figure 4. — Ffioladomya arata V. and S., 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. — Fecchiolia gemma, vi, \). 258. Typo 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 ccelata V., p. 278. Type specimen. View of the exterior; x 8 

 diameters. 



Figure 9a. — The same valve, view of the interior; x 8 diameters. 



