53-1 PROCEEDINGS OF THE ACADEMY OF [Nov. 



NOTES ON SOME PLEUR0T0MARIID2E OF THE CRETACEOUS OF NEW JERSEY. 



BY HENRY A. PILSBRY, Sc.D. 



The following notes are based upon a study of the type specimens 

 of the species discussed, together with other examples in the collection 

 of the Academy. The generic term Pleurotomaria is here used in the 

 older, wide sense. 



Pleurotomaria crotaloides (Morton). 



Cirrus crotaloides Morton, Synopsis Organic Remains Cretaceous group of 



the U. S., p. 49, pi. 19, fig. 5, 1834. 

 Pleurotomaria crotaloides Pils., Proc. A. N. S. Phila., 1896, p. 11 (notes on 



Morton's type specimen). 



This species is represented in the collection of the Academy by 



the type specimen from Erie, Ala., figured 

 by Morton, and a smaller example from 

 Uniontown, in which the slit is well shown. 

 It is 17 mm. long, so far as preserved, 

 probably about 20 when perfect, and 1 mm. 

 wide (fig. 1). Both specimens are internal 

 casts. 



In 1896 the writer identified a much 



Fi j P crotaloides larger cast from Mullica Hill with P. 



crotaloides, a conclusion which renewed 

 study shows was erroneous. The Mullica Hill example differs in 

 several important particulars, as indicated below under P. woolmani. 

 In 1907 Professor Stuart Weller understood P. crotaloides to 

 include Architectonica abbotti Gabb as well as the form now differ- 

 entiated as P. woolmani. This course seems to me untenable, for 

 reasons given below. So far as present information and collections 

 show, P. crotaloides (Morton) is not known to occur in New Jersey. 



Pleurotomaria abbotti (Gabb.). 



Architectonica abbotti Gabb, Proc. A. N. S. Phila., 1861, p. 321. 

 Margaritella abbotti Gabb, Whitfield, Gastrop. and Ceph. of the Raritan 



Clays and Grcensand Marls of New Jersey, p. 134, pi. 17, figs. 12-15. 

 Pleurotomaria crotaloides Morton, Weller, Rep. on the Cret. Paleont. of 



New Jersey, 1907, p. 665. Not of Morton. 



Professor Whitfield's figures give a good idea of this species, though 

 they are somewhat "restored," the plication below the suture being 

 made continuous, whereas in the shells it has been partially effaced; 



