EXPLANATION OF PLATE CIX. 



BCLEMNITELLA AMERICANA (Morton) P- 39 



1. Ventral view of a large individual showing the slit. 



2. Another view of the same individual with a section removed 



to show the alveolar cavity. 



3. View of a smaller individual preserving the mucronato ex- 



tremity. 



Navcsink marl; Holmdel. 



4. View of a cast of the alveolar cavity. 



Navcsink marl; Atlantic Highlands, (wS). 



BACULITES OVATUS Say, p. 821 



5. Lateral view of an internal cast. 



Navesink marl; Atlantic Highlands, (108). 



BACUUTES AS PER Morton ?, P- 823 



6-7. Two views of a specimen identified and illustrated by Whit- 

 field. 



Navesink marl; Holmdel. 



i 



