EXPLANATION OP PLATE XLIX. 



PECTEN AKGILLENSIS Conrad, p. 472 



1-2. Views of two nearly circular individuals illustrated by 

 Whitfield. 



Navesink marl; Freehold. 



3-4. Views of two individual valves of normal form and size. 

 Internal casts. 



Woodbury clay; Lorillard, (102). 



PECTEN BURUNTONENSIS Gabb, p. 470 



5. A large internal cast of a single valve. 



6. A small single valve of the form called P. perlamellosus 



by Whitfield. 



Mcrchantville clay-marl; near Matawan, (101). 

 7-8. A cast of the interior and the natural impression of the 

 exterior of a single valve. 



Merchantville clay-marl; Lenola, (163}. 

 9. A large internal cast of a single valve. 



Woodbury clay; Lorillard, (102}. 



PECTEN sp. 



10. View of an internal cast. 



Manasquan marl; Farmingdale, (138). 



