PLATE LXXVII. 



PAGE 



Figs. 1, 2. Venus campechiensis var. mortoni (Conrad) 307 



1. Exterior of right valve. Cove Point. 



2. Interior of left valve. Same locality. 



Figs. 3-6. CiiioxE LATiLiRATA (Conrad) 309 



3. Exterior of right valve. Plum Point. 



4. Exterior of right valve. Same locality. 



5. Dorsal view. The Pliocene of the Waccamaw beds, S. C, length 



34 mm. (After Dall.) 



6. Interior view of right valve. Plum Point. 



