EXPLANATION OF PLATE L- 



PECTEN CONRADI (Whitfield), p. 474 



1-3. Views of the internal casts of three single valves. 



4. The internal cast of one valve and the impression of the 



exterior of another. 



Woodbury clay; Lorillard, (102). 



PECTEN PARVUS (Whitfield), p. 477 



5. View of the type specimen, (x2). 



6. View of the surface markings, (much enlarged). 



Navesink marl; Freehold. 



PECTEN CUFFWOODENSIS n. sp., p. 469 



7-8. Views of two internal casts of single valves. The type 

 specimens. 



Cliff wood clay; Cliff wood Point, (105). 



PECTEN TENUITESTUS Gabb, p. 467 



9. View of a squeeze taken from a natural mould of the 

 exterior. 



Navesink marl; near Walnford, (149). 



PECTEN QUINQUENARIA Conrad, p. 476 



10-12. Views of three imperfect internal casts of separate valves. 



Weitonah sand; near Marlboro, (130). 



13. A nearly complete individual preserving the shell, from near 

 Dumas, Mississippi. (Coll. U. S. Nat. Mus., No. 20723.) 



PECTEN WHITFIELDI n. sp., p 468 



14- View of the type specimen, figured by Whitfield as P. tenui- 

 testus Gabb. 



Navesink marl; Holmdel. 



P-CTEN CRATICULUS Morton, p. 478 



15-16. Two views of the type specimen. (After Whitfield.) 

 Navesink marl; Arneytown. 



982 



