PLATE LXIV. 
PAGE 
Figs. 1,2. CH^TOPLEtTBA APicuLATA ( Say ) 270 
la. Ventral view of posterior valve. 3 miles south of Chesapeake 
Beach, 
lb. Dorsal view of the same specimen. 
2a. Dorsal view of anterior valve. Plum Point. U. S. National 
Museum. 
2b. Ventral view of the same specimen. 
2c. Anterior view of the same specimen. 
Pig. 3. De:«talium attenuatum Say 271 
3. Specimen from St. Mary's River. 
Fig. 4. Dentalium danai Meyer 272 
4. Specimen from Plum Point. 
Figs. 5a, 5b. Dentalium caduloide Dall 272 
5a. View of specimen from St. Mary's River. U. S. National Museum. 
(After Dall.) 
5b. View of aperture of the same specimen. (After Dall.) 
Fig. 6. Cadulus thallus (Conrad) 273 
6. Specimen from Plum Point. 
Fig. 7. Cadulus newtone.nsi.s Meyer and Aldrich 273 
7. Specimen from Jones Wharf. 
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