PLATE 14. 



Page 

 Fig. 1. Stbophodonta AMPLii 93 



1 a. A dorsal view of a young individual. 



1 6. An impression of a dorsal valve of a specimen of medium size, uliowing the cavity left by 



the cardinal process. 

 1 e. A ventral valve of a larger individual. 

 1 d. A profile of the specimen fig. 1 c. 

 J e. A dorsal view of a large individual. 

 I /. An enlargement of the surface, showing the transverse strise and the elongate, pustulosc 



elevations upon their surface. 

 1 g-. The cardinal area of the ventral valve with a narrow, linear callosity closing the deltidium, and 



a smooth triangular area which is continuous with the other portions of the sane (urface, 



and hag apparently never been a foramen. 

 1 A. The interior of a ventral valve, showing the strong flabelliform muscular sear. The margin 



of the area is brol^en (a usual condition) by tlie removal or the separation of the dorsal 



valve. 



1 t. A cast of the ventral valve from the Schoharie grit, showing the muscular sear and the 



strongly punctate surface. 



Fig. 2. Strophodonta oonoava 96 



2 a. View of a ventral valve which is constricted just below the cardinal e-\tremities. 

 2 6. A profile of the same. 



2 c. The interior of a dorsal valve, showing the muscular impressions and cardinal process. 



3 d. A cardinal view of a cast of the ventral valye, showing the muscular impressions. 



