750 CRETACEOUS PALEONTOLOGY. 



spiral ridges upon the body volution, placed at nearly equal 

 intervals, also by fainter vertical ridges which appear usually 

 to have been placed at nearly equal intervals to those of the 

 spiral ridges, though occasionally they are somewhat closer. 

 Upon the external surface, as shown in impressions of the out- 

 side, the revolving and vertical ribs are much more conspicuous 

 than on the casts, their intersections being marked by small, 

 rounded nodes. 



Remarks. — This is a well-marked species and can be easily 

 recognized. It most resembles P. octolirata, but the summit of 

 the outer volutions adjacent to the suture is less flattened, and 

 the outer volution is marked by a larger number of revolving 

 costs which are crossed by transverse costs at more frequent 

 intervals. In the recent collections of the Survey the species has 

 been found to be common in the Wenonah sand at one locality, 

 and one of Whitfield's specimens came from the same horizon. 

 It also occurs in the Navesink marl. 



Formation and locality. — Wenonah sand, near Crawfords 

 Corner (126^), near Middletown (Whitfield); Navesink marl, 

 near Red Bank (120), Crosswicks Creek (147*), near Walnford 

 (Whitfield). 



Geographic distribution. — New Jersey. 



Pyropsis whitfieldi n. sp. 

 Plate LXXXVIIL, Figs. 14-16. 



1892. Pyropsis octolirata Whitf., Pal. N. J., vol. 2 (Alonog. U. 

 S. G. S., vol. 18), p. 36, pi. 2, figs. 8-g, not fig. 10. 

 (Not P. octolirata Conrad.) 



Description. — Shell small, subglobular or subpyriforra in form, 

 with about three, ventricose, rapidly expanding volutions; the 

 dimensions of a nearly complete internal cast being: height, 19.5 

 mm., which might be increased to 25 mm. if the anterior canal 

 were complete; maximum diameter, 16 mm. ; height of spire, 5.5 

 mm. Spire low-conical, volutions distinctly flattened adjacent to 

 the suture, marked by from six to nine spiral ridges or costse 



