HELIX. 133 



constricted towards the aperture ; aperture tridentate, one entering, 

 oblique, compressed tooth on the parietal wall, two submarginal 

 teeth within the whitish reflected lip. Diam. 9 mill. 



Honduras. 



H. OPPILATA, Morelet. PI. 27, figs. 84, 85. 



Narrowly umbilicated, thinly striate, subpellucid, somewhat 

 shining, light corneous, suture deep; whorls 5-5J, a little convex, 

 slowly enlarging, the last suddenly deflected in front, constricted 

 towards the aperture, base inflated; aperture diagonal, lunate-cir- 

 cular externally, ringent within, ear-shaped, whitish corneous, the 

 parietal wall with a V-shaped tooth, basal with another tooth, outer 

 wall with a third, wider, and forked. Diam. 7-8*66 mill. 



Yucatan. 



H. DORFEUILLEANA, Lea. PL 27, figs. 86, 87. 



Obtusely conical above, periphery slightly angulated; whorls 6, 

 with well-impressed suture, ribbed, smoother below, deflected in 

 front, constricted but not scrobiculate behind the aperture; 

 extremities of the lip joined by a parietal callus forming a quadrate 

 tooth, far within, behind the parietal tooth, are tA\ T o rounded tubercles, 

 one superior, the other basal; base shoAving 1J whorls and a minute 

 perforation; whitish. Diam. 7*5 mill. 



Kentucky, Tennessee. 



H. IMPLICATA, Beck. PL 28, figs. 92-94. 



Widely, perviously umbilicated, obliquely striulate, light corneous 

 or whitish ; whorls 5, slowly increasing, somewhat convex, the last 

 obtusely angulated, deflected in front and constricted behind the 

 aperture; peristome shortly reflected, the margins joined by a 

 parietal callus forming a triangular tooth, lip with two equal, sub- 

 approximate teeth. Diam. 8 mill. 



Vera Cruz, Mexico. 



H. PLAGIOGLOSSA, Pfr. PL 28. figs. 95-97. 



Narrowly, perviously umbilicated, solid, arcuately striulate, 

 scarcely shining, fulvous corneous, suture impressed; whorls 5J, the 

 last descending in front, constricted below, base more convex; 

 peristome whitish, margins distant but slightly converging, connected 

 by a parietal callus bearing an oblique tongue-like tooth, base with 

 two approximate nodiform teeth. Diam. 9 mill. 



Oajaca, Mexico. 



