PLATE VII. 



Page. 



Pecten venustus Mortou 45 



Fig. 1. View of a cast of a right valve enlarged to two diameters. 



2. Enlarged view of aright valve, preserving the shell, from Freehold, N. J. 

 X View of a left valve. The curved lines indicate the degiee of convexity. 

 4. Enlarged view of the hinge of the speciaien. Fig. •^. 



Pectkn tknuitkstus Gabb 4 



Fig. 5. View of a left valve, the shell preserved. 



6 View of another left valve, showing a ditierent degree of ornamentation. 



Pectex (Syncyclon kma f ) perlamellosus Whitfuvld 50 



Fig. 7. View of the specimen described, natural size. 



Amusium Conradi Whitfield 5*2 



Fig. 8. View, enlarged, of a left valve showing indistinct radii. 



9. Enlarged view of a right valve showing the concentric lines.. 



10. Enlargement of the concentric lining of the right valve. 



Amusium simplicum Conrad ;' 1 



F)gs. 11 and 12. Enlarged views of specimens of this species from Enfanla, Ala., the typical 

 locality of the species. The lines between these figures show the convexity. 



Pectex quivquenahius Conrad 47 



Fig. 13. View of a small right valve from the limestone nodules at Marlborough, N. J. 

 l4 and 15. Iivipressions in fine micaceous clay, from Freehold. 

 16. Enlargement of the surface from Fig. 14. 



Pecten (Chlamys) CRATicui.i s Morton 49 



Figs. 17 and 18. Views of Dr. Morton's type, the largest fragment I have seen of the spe- 

 cies. 



282 



