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 CLIFFWOODENSIS 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. 

 Wenonah 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. 



Pr.CTEN CRATICULUS Morton, p. 478 



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

 Navesink marl; Arneytown. 



98* 



