PLATE XLIX. 
PAGE 
Fig. 1. Nassa calvektensis n. sp 191 
1. Ventral view. Plum Point. U. S. National Museum. 
Fig. 2. Nassa gubernatoria n. sp 192 
2. Ventral view. Governor Run. 
Figs. 3. 4. Nassa tkivittatoides (Whitfield) 192 
3. Ventral view. Jones Wharf. 
4. Ventral view of another specimen. Same locality. 
Figs. 5a, 5b. Nassa oREENSBORoiiNsis n. sp 194 
5a. Dorsal view. Greensboro. 
5b. Ventral view of the same specimen. 
Figs. 6-8. Nassa mabylandica n. sp 194 
6. Ventral view. St. Mary's River. 
7. Ventral view of another specimen. Same locality. 
8. Ventral view of less elongate individual. Same locality. 
Figs. 9, 10. Nassa peralta Conrad 195 
9. Ventral view. St. Mary's River. 
10. Dorsal view of another specimen. Same locality. 
Fig. 11. Nassa pebaltoides Conrad 195 
11. Ventral view. Jones Wharf. 
Fig. 12. Nassa trivittata Say 196 
12. Ventral view. Possibly from St. Mary's River. 
