MOLLUSCA. 749 



Remarks. : This species is evidently not a true Pyropsis be- 

 cause of the presence of the columellar fold. Whitfield was not 

 able "to place it satisfactorily under any' known genus," at the 

 time he described it, and it may be allowed to remain with a 

 question, where it was placed by the original author. 



Formation and locality. Navesink marl, Mullica Hill (169), 

 (Whitfield). 



Geographic distribution. New Jersey. 



Pyropsis retifer (Gabb). 

 Plate LXXXVIIL, Figs. 7-13. 



1860. Fiisu*s retifer Gabb, Jour. Acad. Nat. Sci. Phil., 2nd sen, 



vol. 4, p. 301, pi. 48, fig. ii. 



1 86 1. Fitsus retifer Gabb, Synop. Moll. Cret Form., p. 108 



(52). 

 1864. Fwsw (?) retifer Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 22. 



1868. Perissolax retifer Con., Cook's Geol. N. J., p. 730. 

 1892. Pyropsis retifer Whitf., Pal. N. J., vol. 2 (Monog. U. S. 



G. S., vol. 18), p. 38, pi. 2, figs. 1-4. 

 1892. Doliu-m (Doliopsis ?) multiliratum Whitf., Pal. N. J., 



vol. 2 (Monog. U. S. G. S., vol. 18), p. 121, pi. 15, 



figs. 4-6. 

 1905. Pyropsis retifer Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 24. 



Description. Shell small, pyriform, or without the anterior 

 canal subglobular in form, the dimensions of a large individual 

 being : height, 22 mm., or probably 25 mm., if the anterior beak 

 were complete; maximum diameter, 18 mm.; height of spire, 6 

 mm. Volutions about three, rounded, ventricose and rapidly in- 

 creasing in size, rapidly contracting below to the short anterior 

 beak, spire low, conical, sutures well marked in the cast ; aperture 

 large, subcircular on the outer margin, about two-thirds as high 

 as the total height of the shell; columellar cavity in the cast 

 rather narrow. Surface of the casts marked by 8 or 10 



