PLATE XL. 



PAGE 



Figs. 1, 2, 3. Veneeicabdia planicosta var. eegia Conrad 178 



1. Anterior view of comislete individual figured on Plates XXXVIII 



and XXXIX. Acad. Nat. Sci., Phila. 



2. Exterior of left valve of very young individual. 



3. Exterior of right valve of ^^oung' individual. 



Figs. 4-6. Venekicaedia potapacoensis n. sp 179 



4. Exterior of left valve of type specimen. West of Port Tobacco. 



5. Exterior of left valve. 



5a. Interior of same specimen. 



6. Exterior of right valve. 



6a. Interior of same specimen. 



Figures 5 and 6 are from specimens in the Philadelphia Acad- 

 emy of Natural Sciences. The locality of these specimens is in 

 doubt, but thej represent that form of V. potapacoensis which 

 occurs typically in the Woodstock substage. 



Figs. 7, 7a. Veneeicabdia maeylandica n. sp 179 



7. Exterior of right valve of tj'pe specimen. 214 miles above 



Popes Creek. 

 7a. Interior of same specimen. 



202 



