EXPLANATION OF PLATE XXXI. 



CUCULLAEA NEGLECTA Gabb, p. 396 



1-2. Views of the right side and posterior end of a very perfect 

 internal cast. 



Navcsink marl; Mullica Hill, (169). 



3-4. Views of the left side and posterior end of a very perfect 

 internal cast. 



Navesink marl; near Holm-del, (127"}. 



CUCULLAEA TIPPANA Conrad, P- 394 



5. The internal cast of a right valve. 



Red Bank sand; Shrewsbury River, (//p). 



6. The cardinal area, a plaster cast from a natural impression 



of the shell. 



Same locality. 

 7-8. External and internal views of a very perfect right valve. 



Marshalltown clay-marl; near Swedcsboro, (/77). 



9-10. Views of two internal casts, a right valve and a left valve. 



Tinton beds; Beers Hill Cut, 



944 



