PLATE VIII. 



Pago 



Camptonectes PAKVU8 Whitfield -^ 



Fig. 1. View of the left valve. Enlarged three diameters. The curved line shows the con- 

 vexity of the valve. 

 •■i. Enlargement of the surface, showing the impressed and interrupted striai. 



Camptonectes Bdrlingtonensis Gabb »• 



Fig. 3. View of left valve of a small shell. 



4. An enlargement of the surface of tbci .'^aiue, showing it.s ti'utnres. 

 .'J. A right valve of similar size. 



6. An enlargement of the surface of the same from near the niiirgin. Both this and 

 the last arc from the typical specimens used by Mr. Conrad in the description 

 of C. belli8culpttts. 



7. View of a largo imperfect valve from Freehold, retaining a part oi the shell. 



8. View of Mr. Gabb's type, which is a cast from Burlington, N. J. 



9. View of a .small valve, showing the stria), from Freehold. 



Pecten planicostatus Whitfield 4i 



Fig 10. View of a left valve, showing the smooth flatteneil ribs 



11. Enlargement of the surface showing the form of rib, smd the fine, even, concen- 

 tric stria*. 



Neithka quisquecostata Lamarck Si 



Figs. 12 and 1:}. Views of a very large lower valve of the species; being only a cast and 



imperfect, it <loes not fully show the features of the ribs. 

 Fig. 14. View of a small ujiper valve, from agtitta-percha impression in the natnral mold, 

 Holradel, N. J. 



284 



