58 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



Tindaria callistiformis Verrill and Bush. 



Fig. 11. Hinge of a right valve (mag. 8 diam.) front view, introduced here for com- 

 parison of crenulate dentition with that of Nuculites rohustus, figure 14. Copied from 

 figure 21 on page 61 of Verrill and Bush article in Amer. Journ. Sci., ser. 4, vol. 3, 

 1897. - 



Locality. — Recent off Atlantic coast of North America. 



Nuculites crassus Williams. 



Fig. 16. Mold of interior of a left valve, showing the strong clavicle and posterior 

 muscular scar (M 1761 A). 



Locality. — Pembroke shales, in cove between Youngs Point and extremity of Den- 

 bow Neck, Lubec (loc. No. 5.24.6 B). 



17. Another mold of interior of a left valve, showing the crenulate hinge both sides 

 the beak, the strong clavicle and muscular scars (M 1761 B). 



Locality. — Same as figure 16 (loc. No. 5.24.6 B). 



