82 HELIX. 



H. TRENQUELLEONIS, Grat. PL 18, fig. 59. 



Narrowly umbilicated, rather thin, subpellucid, slightly shining, 

 obsoletely opaquely plicate above, decussated by spiral striae, smooth 

 below, olivaceous brown, with a single, superior, chestnut band; 

 whorls 4J, rather flat, rapidly increasing, the last depressed, deflected 

 in front, base a little more convex ; peristome shortly expanded, red- 

 lipped within, margins approaching, joined by a thin callus. 



Diam. 26 mill. 



Cordova, Argentine Republic. 



Unfigured Species. 



H. HIDALGONIS, Doring. Argentine Republic. 



H. MONOGRAPHA, Burmeister. Argentine Republic. 



Both the above species have been figured, but the figures are want- 

 ing in the Philadelphia Academy's copies of the works which should 

 contain them. 

 H. GUEINZII, Pfr. Moyobamba, Peru. 



Subsection VIII, EURYCAMPTA, Albers, 1860. 



H. BONPLANDI, Lam. PI. 19, fig. 95. 



Narrowly umbilicated, chestnut color, obsoletely doubly banded 

 with chocolate, subdecussated by very thm incremental and spiral 

 stride; whorls 4J-5, somewhat convex; aperture brownish violaceous, 

 peristome simple, right margin patulous, the basal somewhat thick- 

 ened, the columellar reflected. Diam. 29-35 mill. 



Cuba. 

 H. SUPERTEXTA, Pfr. PI. 19, fig. 94. 



Narrowly umbilicated, somewhat solid, subdecussated by incremen- 

 tal striae and impressed concentric lines, brownish fulvous, with a 

 median chestnut band, suture deep, crenulated, epidermis radiately 

 hydrophanous; w r horls 5, convex; aperture brownish, peristome white, 

 expanded above, thickened and reflected below. Diam. 24 mill. 



Near Matanzas, Cuba. 



Like H. Bonplandi, but smaller with more convex whorls, more 

 slowly increasing, with different epidermis. 



H. ARCTISTRIA, Pfr. PI 19, figs. 96, 97. 



Very narrowly umbilicated, rather solid, closely, obliquely costu- 

 late-striate, light brownish, with two dark bands, and numerous 



