HELIX. 145 



H. INTROFERENS, Bland. PL 30, figs. 96-98. 



Thin, with rib-like stride, yellowish horn color, whorls 5-6, some- 

 what rounded, the last descending, constricted behind the lip, with 

 exterior pits marking the position of the teeth, periphery subaugular; 

 parietal tooth oblique, lamelliform, basal lip tooth submarginal with 

 a strong white tubercle behind it, upper lip tooth transverse ; base 

 convex, grooved within the open umbilicus. Diam. 1115 mill. 



North Carolina, Philadelphia, Pa. (small form). 



Distinguished by its narrow, grooved umbilicus and tubercular 

 basal tooth. 



H. VAN NOSTRANDI, Bland. PL 30, fig. 99. 



More decidedly costate, more convex at the base, with smaller 

 umbilicus and without the internal tubercle of H. introferens; but 

 may be only a variety of that species. Diam. 12'5 mill. 



Aiken, So. Carolina. 



H. LORICATA, Gould. PL 30, figs. 5-8. 



Whorls 5, convex, thin, obliquely striate, fresh specimens hispid, 

 much contracted behind the lip, dark horn color; aperture trans- 

 versely trilobate, the very oblique parietal tooth quite small, the 

 two lip teeth scarcely distinct ; base very convex, umbilicus narrow 

 and deep, slightly contracted by the lip. Diam. 6-8 mill. 



California. 



H. Lecontei, Lea is a synonym. 



H. MULLASTI, Bland and Cooper. PL 30, figs. 9-12. 



Irregularly striate, shining, with a thin epidermis, covered with 

 minute spiral lines and tubercles (scars of hairs); whorls 6, convex, 

 much constricted behind the aperture, smoother on the base ; aperture 

 trilobate, the parietal tooth small, linguiform, lower lip tooth 

 lamelliform, upper one small, sometimes obsolete; umbilicus moderate, 

 partially covered by the lip; dark horn color. Diam. 13'5 mill. 



Oregon, Washington Tor. 



Mr. Binney formerly considered this indentical with If. devia, 

 Gould ; I agree with him that it is probably distinct, although they 

 approach closely in some specimens. 



H. SANBURNI, W. G. Binney. PL 38, figs. 100, 1. 



Narrowly umbilicated, thin, sparsely hirsute, scarcely striate, 

 yellowish horn-colored; whorls 51, slightly convex, the last hardly 



descending, convex beneath ; aperture trilobed, with a heavy, promi- 

 10 



