OF NORTH AMERICA. 



383 



leated; nuclear whorls 1*4, small, well rounded, white or wine colored 

 (pi. XLIX, fig. J) ; whorls 5 to 6, well rounded, the body whorl typical- 

 ly very large and moderately convex; spire varying from short, de- 

 pressed, dome-shaped to turreted, acutely conical or pyramidal ; sutures 

 impressed, in some specimens almost channeled; aperture ovate or 

 long ovate, somewhat produced and effuse anteriorly, as long as, or 

 longer than, the spire; peristome thickened within by a longitudinal 

 varix edged with chestnut; inner lip narrow, reflected and appressed 

 tightly to the columellar region, either completely closing the umbilicus 

 or leaving a very small, narrow chink ; columella with a heavy oblique 

 plait causing the axis to be twisted; in specimens from some locali- 

 ties the shell is very solid and the inner lip and axis is covered by a 

 heavy coating of white, shelly material. The parietal wall is covered 

 by a more or less thickened callus. 



TYPES: Catascopium, two specimens, Academy of Natural Sci- 

 ences, Philadelphia, No. 58486; pinguis, two specimens, Phil. Acad., 

 No. 58571; brownii Tryon, one specimen, Phil. Acad., No. 58516; 

 linsleyi DeKay, N. Y. State Museum, Albany; intertexta, Kent Sci- 

 entific Museum, Grand Rapids, Mich. ; cotypes, coll. Bryant Walker, 

 No. 17358 ; cornea Val., location not ascertained. 



TYPE LOCALITY : Catascopium and pinguis, Delaware River, Phil- 

 adelphia, Pa. ; brownii, Elyria, Ohio ; linsleyi, Stratford, Conn. ; cornea, 



