PLATE 6 

 Cypricardella norumbegae Clarke 



Page 34 



i, 2 Left valves, the latter retaining a portion of the thick shell substance 



3, 4 Right valves 



Edmondia ? sp.. 



5 Internal cast of a large right valve of uncertain generic relations 



9, 10 Two views of a shell which seems to be allied to the foregoing 



Modiomorpha impar Clarke 



P ige 31 



6-8 A right and two left valves of this species 



(Pectunculus ? ?) plutonicus nov. 



Page }S 



ii,i2 Cardinal and profile views of the specimen described 



i 7 s 



