PLATE LV. 
PAGE 
Figs. 1, 2. Tritonium centeosum (Conrad) 225 
1. Ventral view. Plum Point. 
2. Ventral view of younger individual. Same locality. 
Fig. 3. Pyrula harrisi n. sp 226 
3. Ventral view. Plum Point. 
Fig. 4. Cassis c.elata Conrad 226 
4. Ventral view. St. Mary's River. 
Fig. 5. Erato perexigua ( Conrad ) 227 
5. Ventral view. Plum Point. U. S. National Museum. 
Fig. 6. Seila adamsii (H. C. Lea) 228 
6. Ventral view. Plum Point. 
Fig. 7. Cekithiopsis calvektensis n. sp 229 
7. Ventral view. Plum Point. 
Fig. 8. Cerithiopsis subulata (Montagu) 230 
8. Ventral view. Greensboro. 
Fig. 9. GONIOBASIS MARYLANDICA n. Sp 230 
9. Ventral view. St. Mary's River. 
Fig. 10. Cecum calvertense n. sp 231 
10. Specimen from Church Hill. 
Figs. 11, 12. C^CUM PATUXENTIUM n. sp 231 
11. Specimen from Greensboro. 
12. Specimen from Governor Run (lower bed). 
Fig. 13. C^cuM greensboroexse n. sp 231 
13. Specimen from Greensboro. 
Figs. 14, 15. Vermetus graniferds (Say) 232 
14. Specimen from Church Hill. 
15. Specimen from Jones Wharf. 
Fig. 16. Vermetus virginicus (Conrad) 232 
16. Specimen from Plum Point. 
