ELASMOBRANCHIL 



105 





<3V 



mCXSiiS 



Fig. 56. — Rhinoptera dubia Leidy. *Fortesque. 



11 



CZ 



WmmnmE^ 



r> CZZD 



J 3 czzz> 



Fig. 57. — Rhinoptera dubia Leidy. 1-2, Monmouth Co. (Knieskern) ; 3-8, 

 Monmouth Co. (Cleburne) ; 9-10, Vincentown (Barrett) ; 11-12, Bridgeton 

 Pike (Abbott). 



FRAGMENTARY SELACHIANS. 



A large number of detached vertebrae (Figs. 58, 59) are in the 

 collection of the Academy, representatives of which I have fig- 



