MOLLUSCA. 739 



whose dimensions are given above, has been compared with the 

 type of the species and other examples in the collections of the 

 Philadelphia Academy of Science and the National Museum, 

 and its specific identity is certain. The examples from the 

 southern localities show that the shell substance was thin. The 

 New Jersey specimen is a modified internal cast and shows most 

 of the external surface markings of the shell. 



Formation and locality. Wenonah sand, near Marlboro 



(130). 



Geographic distribution. New Jersey, North Carolina, Mis- 

 sissippi. 



Genus PYROPSIS Conrad. 



Pyropsis richardsoni (Tuomey). 



Plate LXXXVL, Figs. 2-5. 



1854. Pyruiai \Richardsonii Tuomey, Proc. Acad. Nat. Sci. 



Phil., vol. 7, p. 169. 

 1860. Tudicla (Pyropsis) perlata Con., Jour. Acad. Nat. Sci. 



Phil., 2nd sen, vol. 4, p. 288, pi. 46, fig. 39. 



1860. Rapa elevata Gabb, Jour. Acad. Nat. Sci. Phil., 2nd ser. t 



vol. 4, p. 301, pi. 48, fig. 12. 



1 86 1. Perissolax Richardsoni Gabb, Synop. Moll. Cret. Form., 



p. 123 (67). 

 1 86 1. Tudicla elevata Gabb, Synop. Moll. Cret. Form., p. 141 



(85)- 

 1861. Tudicla (Pyropsis) perlata Gabb, Synop. Moll. Cret. 



Form., p. 141 (85). 

 1864. Tudicla (Pyropsis) perlata Meek, Check List Inv. Foss. 



N. A., Cret. and Jur., p. 23. 

 1864. Perissolax (?) Richardsoni Meek, Check List Inv. Foss. 



N. A., Cret. and Jur., p. 23. 

 1864. Tudicla elevata Meek, Check List Inv. Foss. N. A., Cret. 



and Jur., p. 23. 



1868. Tudicla elevata Con., Cook's Geol. N. J., p. 730. 



1869. Rapa elevata Con., Amer. Jour. Conch., vol. 4, p. 248. 



