MOLLUSCA. 815 



Class CEPHALOPODA. 



Sub-class TETRABRANCHIATA. 



Order NAUTILOIDEA. 



Family OLYDONAUTILIDAE. 



Genus HERCOGI,OSSA Conrad. 



Herecoglossa paucifex (Cope). 

 Plate GIL, Fig. i. 



1866. Aturia paucifex Cope, Proc. Acad. Nat. Sci. Phil., 1866, 



P- 3- 



1868. H ercoglossa paucifex Con., Cook's Geol. N. J., p. 731. 

 1892. H ercoglossa paucifex Whitf., Pal. N. J., vol. 2 (Monog. 



U. S. G. S., vol. 1 8), p. 246, pi. 39, fig. i. 

 1905. H ercoglossa paucifex Johns., Proc. Acad. Nat. Sci. Phil., 



1905, p. 28. 



Description. "Shell large, somewhat ponderous, ventricose, 

 with a broadly rounded back and convex sides ; umbilicus slightly 

 impressed, but not open, the inner edge of the lip rather overlap- 

 ping the one within, and the outer volution embracing the inner 

 to that extent; aperture large, forming half of a long ellipse, 

 being rounded on the outer margin and gradually expanding to 

 the edge of the umbilical depression, or for nearly four-fifths 

 of the entire length of the opening. On the inner side it is 

 strongly modified by the projection of the inner volution; entire 

 length of the apertural opening, 5^2 inches on the specimen; 

 greatest width across, nearly 4 inches. Septa strong, deeply 

 concave and distant, being nearly 3 inches apart on the back of 

 the specimen described at the third chamber, and nine chambers 

 only visible to the volution; lateral septal processes situated 

 nearer to the outer margin than to the umbilicus, and are large, 

 strong, slightly directed outward from a circular line half as wide 

 across the origin as long, that of the second septum shown on 

 the specimen being 2 inches long from the curve of the inner por- 



