148 HELIX. 



H. OBSTRICTA, Say. PL 30, figs. 22-24. 



Imperforate, pale to dark brown, acutely carinated, the carina 

 visible on all except the apical whorls, with distant, sharp, oblique 

 costse, fringing the edge of the carina in crossing it, and frequently, 

 slight, close spiral lines; whorls 5, depressed-convex above, more 

 convex below ; aperture trilobate, with widely reflected lip, parietal 

 tooth strong, oblique, upper lip tooth small, basal tooth long, blade- 

 like. Diam. 22 mill. 



Western and Southern United States. 



Differs from the preceding in its strong carina and in not being 

 hispid. 



H. helicoides, Lea is a synonym. 



H. APPRESSA, Say. PL 30, figs. 28, 29. 



Imperforate, yellowish horn color, obliquely costulate above, 

 smooth beneath; whorls 5, slightly convex, the periphery sub- 

 angulate, constricted behind the widely reflected lip; aperture 

 trilobate, with a long, oblique parietal tooth, a lamellar basal and 

 a small upper lip tooth, the latter sometimes obsolete. 



Diam. 18 mill. 



Mostly West of the Appalachian Mountains, extending from New 

 York to Georgia and Illinois; also Wilmington, N. C. etc. 

 Smaller, and without the hispid surface of H. palliata. 

 H. linguifera, Fer. is a synonym. 



*** 



H. ELEVATA, Say. PL 31, figs. 57-69. 



Imperforate, thick, finely obliquely striated, yellowish horn color, 

 suture well-impressed ; whorls nearly 7, convex, slowly increasing, 

 body- whorl large and well-rounded ; aperture somewhat triangular, 

 contracted by the lip, which is thickened, but not very broadly 

 reflected, and covers the umbilicus ; a long lamellar tooth is on the 

 base of the lip, and the parietal wall has a stout tooth curving 

 inwards above. Diam. 23 mill. 



W. New York to West Virginia, and westward to Wisconsin and 

 Missouri. 



Mr. W. G. Binney has Wisconsin specimens remarkable for the 

 presence of chestnut bands on the periphery. H. Knoxvilliana, Fer. 

 and H. Tennesseensis, Lea are synonyms, the latter a juvenile, 



