LYMN^ID^E OF NORTH AMERICA. 383 



leated; nuclear whorls 1%, 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. 



Length. 

 20.10 

 17.50 

 14.50 

 14.00 

 9.10 

 22.50 

 15.00 

 14.50 

 18.00 

 11.80 

 16.10 

 15.50 

 11.50 

 15.10 

 14.50 

 15.00 

 13.75 

 13.00 

 20.00 

 19.50 

 15.75 

 13.10 



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, 



Width. 



Aperture length. 



Width. 





11.00 



12.00 



6.00 mill. 



Say's type. 



9.75 



10.00 



5.00 " 



" " 



10.00 



10.00 



5.00 " 



Type pinguis. 



8.50 



9.00 



5.00 " 



" " 



5.50 



6.00 



2.80 " 



Type brownii. 



11.00 



12.00 



6.50 " 



Delaware River. 



9.00 



9.00 



5.25 " 



" " 



8.10 



9.00 



4.30 " 



Genesee River. 



8.10 



9.10 



4.75 " 



a a 



6.80 



8.10 



3.50 " 



" " 



8.50 



9.00 



4.60 " 



Pine Lake, Mich. 



8.25 



9.00 



4.60 " 



" " 



8.00 



8.50 



5.00 " 



" " 



8.10 



7.50 



4.25 " 



it it 



8.50 



8.50 



4.80 " 



Ohio. 



9.00 



8.75 



5.00 " 



Mohawk River. 



8.50 



8.00 



4.90 " 



" " 



6.00 



6.50 



3.00 " 



Cotype intertexta. 



11.00 



12.00 



5.50 " 



Black Lake. 



11.50 



12.60 



6.00 " 



" " 



9.00 



9.80 



4.80 " 



Seneca Lake. 



8.00 



8.50 



4.50 " 



K « 



