126 HELIX. 



H. GYRELLA, Morelet. PL 25, figs. 96-98. 



Very widely umbilicated, thin, closely covered by hair-like 

 .strise above and below, livid corneous, base paler; whorls 5, 

 slightly convex, with deep suture, the last depressed, not descending 

 in front ; aperture scarcely oblique, rounded, the lip simple, 

 -straight, Diam. 10 mill. 



Urubamba, Peru. 



H. PSEUDO-PLANORBIS, Lubomirski. PL 26, figs. 1-3. 



Very widely umbilicated, planorboid, closely obliquely striated, 

 epidermis light yellowish brown, suture deep ; whorls 6-7, the last 

 not descending; peristome simple. Diam. 16'5 mill. 



Pujupe, Peru, 10,000 ft. alt. 



H. WALLISIANA, Mousson. PL 26, figs. 19-21. 



Widely umbilicated, thin, striate, diaphanous, yellowish corneous, 

 suture well impressed ; whorls 6, slowly increasing, convex, the last 

 scarcely wider, not descending, declining above near the aperture ; 

 "base more convex; aperture obliquely lunar, with a deep-seated 

 basal lamella, lip straight, obtuse, margins joined by a thin 

 lamella. Diam. 11 mill. 



i f Central America. 



H. POLLODONTA, Orb. PL 26, figs. 4-6. 



Widely umbilicated, somewhat solid, closely plicate, greenish 

 corneous ; whorls 7, slightly convex, the last dilated and deflected 

 in front ; aperture oblique, lip unidentate, the tooth continued and 

 connected with four others one-fourth of a whorl within, lip thick- 

 ened and reflected below. Diam. 9 mill. 



Bolivia. 



H. ENTODONTA, Pfr. PL 26, fig. 9. 



Widely umbilicated, rather solid, densely striated, pellucid, 

 whitish hyaline ; whorls 7, convex, very narrow, the last irregular, 

 flattened in front, with three interior teeth, dilated, scarcely 

 descending ; aperture diagonally ear-shaped, the margin shortly 

 reflected, flexuous. Diam. 6*5 mill. 



Cuenca, Equador. 



H. HELICYCLOIDES, Orbigny. PL 26, figs. 10-12. 



Very widely umbilicated, somewhat thin, obliquely striulate, 

 subdiaphanous, shining, greyish yellow; whorls 10, convex, very 

 narrow, the last of double width, descending in front, with a flat 



