HELIX. 153 



ture, behind which it is a little constricted; aperture obliquely 

 semilunar, lip white, moderately reflected, parietal wall with a slight 

 tooth, sometimes obsolete or undeveloped; umbilicus open but partially 

 circumscribed by the lip ; uniform light horn or straw color. 

 Diam. 25 mill. 



United States, east of the Rocky Mts* 



Var. BUCCULENTA, Gould. Figs. 78-80. 



Smaller, more globular, darker (often reddish horn-color), with 

 less open umbilicus. Diam. 16 mill. 



In the Southern Atlantic and Gulf States, Eastern Pennsylvania, 

 New York etc. this form largely replaces the typical thyroides. 

 Of late years it has been considered a distinct species, but Mr. W. G. 

 Binney in his last work reunites it with thyroides ; perhaps properly. 



H. rufa, DeKay is a synonym. 



H. CLAUSA, Say. PL 32, figs. 81-83. 



Subglobose, moderately thick, with fine oblique striae, spire convex,, 

 with distinct suture; whorls 5, convex, the last large, contracted 

 behind the lip, base very convex; aperture rounded, lip white, 

 narrowly reflected, nearly covering the umbilicus ; light yellowish 

 brown, shining. Diam. 13-15 mill. 



Middle Western United States, Great Lakes to Mississippi and 

 Alabama. 



H. Ingallsiana, Shuttlew. is a synonym. 



H. DOWNIEANA, Bland. PL 32, figs. 84, 85. 



Subglobose, thin, subpellucid, with obsolete rib-like striae, and 

 crowded minute revolving lines; spire depressed conical, suture 

 moderate; whorls 5, convex, the last tumid, scarcely descending, 

 constricted behind the lip; aperture obliquely lunate, lip whiter 

 narrowly reflected, nearly covering the umbilicus; base convex 

 greenish horn color. Diam. 10'5 mill. 



Franklin Co. Tenn; Whitley Co. Kentucky. 



H. LAWI, Lewis. PL 32, figs. 86, 87. 



Narrowly umbilicated, delicately striate, horn colored ; whorls 4, 

 the last descending and deeply constricted behind the peristome; 

 parietal wall with a linguiform tooth. Diam. 6 mill. 



North Carolina, Georgia, W. Tennessee. 



