PLATE LXXIII. 



PAGE 



Fig. 1. Tellixa ( Angulus) diipliniana Dall 299 



1. Exterior of left valve. Duplin Co., N. C; length 12.5 mm. (After 



Dall.) 



Fig. 2. Tellina (Angulus) umbra Dall 300 



2. Exterior of left valve. Duplin Co., N. C; length 12.5 mm. (After 



Dall.) 



Figs. 3, 4. Macoma lenis (Conrad) 301 



3. Interior of right valve. Jones Wharf. 



4. Exterior of left valve. Same locality. 



Figs. 5, 6. Metis biplicata Conrad 301 



5. Interior of left valve. Jones Wharf. 



6. Exterior of right valve. Same locality. 



Fig. 7. Macoma marylandica n. sp 302 



7. Interior of right valve. 



Figs. 8, 9. Petricola harrisii Dall 302 



8. Exterior of right valve. Jones Wharf. 



9. Interior of left valve. Same locality. 



Figs. 10-12. Petricola (Petricolaria) calvertexsis Dall 303 



10. Exterior of right valve. Miocene of Maryland; length 17.5 mm. 



(After Dall.) 



11. Distorted right valve. Jones Wharf. 



12. Left valve. Same locality. 



Figs. 13, 14. Callocardia (Agriopoma) sayaxa (Conrad) 313 



13. Exterior of right valve. Jones Wharf. 



14. Interior of right valve. Same locality. 



