PLATE XXXIX. 
PAGE 
Fig. 1. Nautilus sp 130 
1. View of exterior of peripheral portion of a septum. Plum Point. 
Cornell University. 
Fig. 2. AcT.EON ovoiDES Conrad 131 
2. Ventral view. Cove Point. 
Fig. 3. AcT.EON PUSILLUS ( Forbes) 132 
3. Ventral view. St. Mary's River. 
Fig. 4. AcT.EON SHiLOHE^'sis AVliitiield 132 
4. Ventral view. Cove Point. 
Fig. 5. ACT.EON CALVERTENSIS n. sp 133 
5. Ventral view. Plum Point. Cornell University. 
Fig. G. VoLviLA IOTA (Conrad ) var. marylandica n. var 134 
6. Ventral view. Cove Point. 
Fig. 7. Volvula iota (Conrad) var. diminuta n. var.. . .' 134 
7. Ventral view. Cove Point. 
Fig. 8. Volvula iota (Conrad) var. calverta n. var 135 
8. Ventral view. Plum Point. 
Fig. 9. Volvula iota (Conrad) var. patuxentia n. var 135 
9. Ventral view. Jones "Wharf. 
Fig. 10. RETU.SA (Cylichnixa) marylandica n. sp 135 
10. Ventral view. St. Mary's River. 
Fig. 11. Retusa (Cylichnixa) conulus (Deshayes) 136 
11. Ventral view. Plum Point. 
Fig. 12. Retusa (Cylkh.xina) subspissa (Conrad) 136 
12. Ventral view of type. Calvert Cliffs. Acad. Nat. Sci., Phila. 
Fig. 13. Cylichna ( ?) greensboroensis n. sp 137 
13. Ventral view. Greensboro. 
Figs. 14, 15. Cylichna calvertensis n. sp 137 
14. Ventral view. Plum Point. 
15. Ventral view of less elongate specimen. Same locality. 
