130 HELIX. 



base; peristome depressed above, white, simple, the extremities 

 joined by a triangular parietal tooth. Diam. 12 mill. 



Idaho. 

 Subsection IV, D^DALOCHILA, Beck. 1837. 



H. ANILIS, Gabb. PL 27, figs. 50, 51. 



Narrowly, rimately umbilicated, very lightly, minutely striulate, 

 white, suture impressed; whorls 4J, somewhat convex, the last a 

 little descending and scarcely constricted anteriorly, base planate ; 

 aperture obliquely subhorizontal, peristome reflected, white, the 

 extremities joined by a parietal tooth, basal margin scarcely tuber- 

 culate, outer margin edentulous. Diain. 13 mill. 



Guaymas, Mexico. 



H. HELICTOMPHALA, Pfr. PI, 27, %S. 52-54. 



Umbilicated, solid, a little shining, obliquely costulate-striate, 

 light yellowish corneous; whorls 5-51, somewhat convex, the last 

 subdeflected in front, subcarinated above the middle, with inflated 

 base and constricted and scrobiculate at the aperture; peristome 

 white, angularly reflected, extremities distant, connected by a thin 

 parietal callus, there is a parietal tooth, with another on the basal 

 and outer margin. Diam. 9-12 mill. 



Chiapa, Mexico. 

 H. HARFORDIANA, Cooper. PL 27, figs. 55-57. 



Widely umbilicated, smooth, translucent, yellowish corneous; 

 whorls 6, slowly increasing, the last anteriorly shortly deflected; 

 peristome, depressed above, white, thickened, the extremities joined 

 by a parietal callus, bearing a triangular tooth, the outer and basal 

 margins each bear a tooth. Diam. 10 mill. 



"Big Trees," Cal 

 H. NOTATA, Poey; PL 27, figs. 58-61. 



Umbilicated, thin, slightly granulated, diaphanous, corneous brown ; 

 whorls 5J, a little convex, the last obsoletely angulated above, with 

 more convex base, shortly deflected anteriorly; aperture diagonal, 

 sinuously lunar; peristome angulately reflected, margins joined by 

 a subtriangular tooth, outer margin with two hook-like teeth, basal 

 with one obtuse tooth. Diam. 10 mill. 



Cuba. 



H. Johannis, Poey (not Mort.) is a synonym. 

 H. FASTIGANS, L. W. Say. PL 27, figs. 62-65. 



Convex beneath, nearly plane above; whorls 6, ribbed above, 

 smooth beneath, periphery sharply carinated, brownish; aperture 



