PLATE XXVII. 



Page. 

 OSTBEA GLANDIFORMIS Whitfield -^ - 205 



Fig. ] . Exterior view of an upper valve from Farmiugdale, N. J. 



2. Interior view of tiie same. 



3. View of a lower valve from near Viuceutown. 



4. and 5. Views of a cast from near Farmingdale. 



Gryph^ Bryani Gabb 206 



Fig. 6. View of a small shell, which shows the scar of attachment at the beak. 

 7. Interior of an older specimen. 

 8" and 9. View^s of an old specimen, all from Mr. Gabb's type series, 



Arca qitindecimradiata Gabb '^'^^ 



Figs. 10. Left view of a large shell preserving the surface to some extent, New Egypt, N. Y. 

 11-13. Views of an internal cast, showing the usual features of the species, New 

 Egypt, N.J. 



Crassatella Delawarensis Gabb - "^ ' ^' 



Fig. 14. View of a small specimen from near New Egypt, preserving the shell. 

 15. View of a cast, the usual condition, from near Farmingdale, N. J. 



Crassatella rhombea Whitfield ''^l*'^ 



Fig. 16. Right view of a specimen preserving the shell, the only one ever foimil, near New 

 Egypt, N.J. 



17. Anterior profile view of the same. 



18. Left view of an internal cast from Squankum, N. J. Columbia College. 



19. Cardinal view of the same. 



322 



