PLATE VIII. 



Page. 



Camptonectes parvus Whitfield ^ 



Fig. I. View of the left valve, Enhirged three diameiters. The curved line shows the con- 

 vexity of the valve. 

 2. Enlargement of the surface, showing the im[)re8sed and interrupted striiB. 



Camptonectes Burlingtonensis Gabb j>^^ 



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



4. An enlargement of the surface of the bame, showing its features. 



5. A right valve of similar size. 



6. An enlargement of the surface of the same from near the margin. Both Ihis and 



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

 of C. hclUsculjyfus. 



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



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



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



pECTEN planicostatus Whitfield 48 



Fig 10. View of a left valve, vshowing the smooth llatteued i ib^ 



U. Enlargement of the surface showing the form of rib, a'ud the fine, even, concen- 

 tric strife. 



Neith ka QUixQUECOSTATA Lauiarck ^^ 



Figs. 12 and 13. Views of a very large lower valve of the sp^cie^; being only a cast and 



imperfect, it does not fully show the features of the ribs. 

 Fig. 14. View^ of a small upper valve, from a gutta-percha impression in the natural mold, 

 Holmdel, N. J. 



284 



