PLATE 6 

 Cypricardella norumbegae Clarke 



P;i S e 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 



Page 31 



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



(Pectunculus ? ?) plutonicus nov. 



Page 35 



ii, 12 Cardinal and profile views of the specimen described 



178 



