140 HELIX. 



The writer may here record his opinion that H. Leaii is also a valid 

 species if other species are to be left to stand on characters which 

 seem to be far less well denned. 



The hirsute group is next in this regard, and when the varieties 

 of hirsuta and stenotrema, above mentioned are taken into considera- 

 tion, the blending of the species into varietal forms is pretty well 

 assured in one or two cases. 



It seems that the Edvardsi group and the spinosa group, of but 

 two species each, though well enough characterized to be distinguished 

 as separate divisions of this genus, may be united with the hirsute 

 group by several characters of greater or less importance. It is not 

 pretended that this grouping is of any systematic value, whatever ; 

 but it will serve to call attention to the relations which the species 

 of this singular genus bear to each other, and to their nearest allies 

 in other genera, the genus gradually shading into Mesodon as 

 represented by H. columbiana, Lea, through H. germana, Gould. 

 A. G. Wetherby. (Journal of the Cincinnati Soc. of Nat. Hist. 

 1880, Vol. Ill, pages 35, 36). 



H. HIRSUTA, Say. PL 29, figs. 53-55. 



Shell hirsute, subglobose, spire convex, elevated, suture deep; 

 whorls 5, convex, periphery subangulated, base well-rounded, 

 umbilicus covered; aperture narrowly transverse, partly filled by 

 the lamelliforin parietal tooth, outer lip with a triangular notch 

 upon its basal portion. Diam. 6 mill. 



New England, Middle and Western States. 



H. STENOTREMA, Fer. PI. 29, figs. 56-58. 



Subglobose, depressed, spire conically convex, suture well- 

 impressed; whorls 5, narrow, slowly increasing, subangulated on 

 the periphery, more convex below, slightly impressed in the umbilical 

 region, finely striate and hirsute; aperture narrow, transverse, sub- 

 basal, partly closed by a long, lamelliform parietal tooth, the narrow, 

 depressed outer lip is reflected close upon the whorl, with a small 

 triangular notch in its centre ; chestnut brown, lips white or pink. 



Diam. 10 mill. 



Western and Southern States. 



Larger and less globose than H. hirsuta, but with a smaller and 

 more central lip notch ; the large parietal tooth is regularly bow- 

 shaped over its edge in this species, instead of sinuous and abruptly 

 terminated as in H. hirsuta 



