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NEW YORK STATE MUSEUM 



spiriferoides [fig. 104], a large rotund smooth, species 

 with valves nearly equally convex and a median depression in 

 the anterior portion of the pedicle valve ; C r y ptonella 

 lincklaeni [fig. 105], a terebratuloid shell with strongly 

 incurved beak, angular umbonal slopes, punctate shell structure 

 and comparatively small and gibbous form ; T r o p i d o 1 e p t u s 

 carinatus [fig. 100], a strophomenoid shell with coarse. 



Fig. 160 Spirifer granulosus 



rounded plications strongest in the center; C a in a r o toe c h i a 

 prolifica [fig. 107], a rhynchonelloid shell with slender 

 angular plications, shallow median sinus which is gently curved 

 upward in front, with nearly straight or slightly carved beak, 

 and of nearly equal length and breadth in young specimens. 



Among the common pelecypods are: Nucula belli- 

 striata [tig. 168], characterized by the regular curve of the 

 ba.sal margin, the position of the beak, one fourth the length 



