PLATE III. 



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OSTREA TEcncosTA Gabb 33 



Fig. 1. Exterior of the type specimen. 



2. Interior of the same. 



OsTREA LARVA var. NASUTA Morton 34 



Fig. 3. A specimen showing more than the nsual number of plications. 

 4. Another individual wifch few plications. 

 OsTREA LARVA Lamarck 3^ 



Fig. 5. Right side of a specimen of the usual character. 



6. Opposite side of the same. 



7. Interior of a specimen showing very many plipatious. 



OSTREA DENTICULIFERA Courad 29 



Fig. 8. Exterior of a specimen identified and labeled by Mr. Courad, from Haddonfield, N. J. 

 9. Interior of the same. 



OSTREA CRENULIMARGINATA Gabb 3Q 



Fig. 10. Exterior view of a single valve from Marlborough, N. J. 

 11. Interior view of the same. 



OSTRE A PLUMOSA Mortou ^^ 



Fig. 12. View of Dr. Morton's type specimen. 

 13. View of a more elongate specimen. 



OSTREA SUBSPATULATA ? Lyell _ _ ^ 32 



Fig. 14. View of a cast which is doubtfully referred to this species. 

 GRYPHiEA VESicuLARis Lamarck 3^; 



Fig. 15. Exterior view of a specimen of the form described by Dr. Morton as G. eonvcxa. 

 16. View of the upper side of a smaller form without the lateral extension. See Plate 

 III, Fig. 2. 



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