Maryland Geological Survey 445 



gins parallel. The inner lip is thin, sharp, widely reflected and discrete 

 from the canal wall, at least in the anterior portion. The umbilical chink 

 is narrow, but usually distinct. 



Pyropsis has been definitely recognized only from the Cretaceous of the 

 Atlantic and Gulf states and the western interior of North America, 

 although some of the South India Upper Cretaceous species referred by 

 Stoliczka to Rapa are certainly much more closely affiliated with Pyropsis. 

 The affinities of certain so-called Pyropses from the Eocene are more 

 doubtful. 



A. Spire flattened; body whorl angulated at the shoulder. . .Pyropsis perlata 



B. Spire often low hut not flattened; hody whorl not angulated at the 



shoulder. 



1. Primary spirals exceeding nine in number upon the hody whorl. 



a. Spirals more or less undulated but not nodose, the primaries 



flattened and suhequal in size and spacing. 



Pyropsis trochiformis 



b. Spiral sculpture on body whorl of alternating series of nodes 



and simple liras Pyropsis reileyi 



2. Primary spirals not exceeding nine in number upon the body 



whorl. 



a. Axial sculpture not developed Pyropsis septemlirata 



b. Axial sculpture developed. 



i. Axials uniform in size and spacing and approximately 

 equal in width to the spirals, 

 a'. Whorls flattened in front of the suture. 



Pyropsis whitfieldi 

 b'. "Whorls not flattened in front of the suture. 



Pyropsis retifer 

 ii. Axials irregular in size and spacing, restricted, for the 



most part, to the ultima .Pyropsis lenolensis 



Pyropsis perlata Conrad 



Tudicla (Pyropsis) perlata Conrad, 1860, Jour. Acad. Nat. Sci., Phila., 2d 



ser., vol. iv, p. 288, pi. xlvi, fig. 39. 

 Pyropsis perlata Tryon, 1883, Struct, and Syst. Conch., vol. ii, p. 142, pi. H, 



fig. 61. 

 Pyropsis perlata Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 23. 

 Pyropsis richardsoni Weller, 1907, Geol. Survey of New Jersey, Pal., vol. 



iv, p. 739, pi. Ixxxvi, figs. 2-5 (ex parte). 



Description. — " Pyriform, tricarinated ; body whorl very wide, pro- 

 foundly carinated and spinous above ; the lower carina or rib less promi- 

 nent than the middle one ; revolving lines crenulated or subtuberculated, 

 alternated on the upper part of the bod}' whorl : aperture wide ; labrum 

 margin crenulated.'' — Conrad, 1860. 

 29 



