HELIX-CHLORITIS. 269 



H. TENELLA Pfeiffer. PL 51, figs. 52, 53. 



Shell umbilicated, depressed, thin, lightly striate, pellucid, pale 

 corneous ; spire plane ; whorls scarcely over 4, a little convex, the 

 last not descending, obsoletely angulated above the middle, inflated 

 beneath, subangulated around the wide, funnel-shaped umbilicus ; 

 aperture oblique, lunate-rounded ; the peristome thin, margin con- 

 verging, right and basal margins expanded, columellar margin sub- 

 dilated. Alt. 8, greater diam. 16, lesser 13? mill. 



Siam. 



H. tenella PFR. Journ. de Conchyl. 1862, p. 42, t. 5, f. 6, 7 ; 

 Monogr. v, p. 390. Chloritis tenella KOCHEBRUNE, Bull. Soc. Phil- 

 omathique de Paris, 1881-2, p. 69, 1882. 



The nearly plane spire, body-whorl bluntly subangular above the 

 middle and around the widely expanded umbilicus, will distinguish 

 this from other similarly sculptured forms. A specimen before me 

 is straw-colored and decidedly larger but has the same number of 

 whorls. Pfeiffer mentions no hairs or hair-scars, but the latter are 

 present on my specimen, and doubtless on the original ones as well. 



H. QUINARIA Pfeiffer. Unfigured. 



Shell sub- widely umbilicated, a little depressed, a little thin, 

 striate and all over granulated, diaphanous, rufous-corneous ; spire 

 little raised, apex obtuse ; whorls 5, a little turgid at the suture, the 

 last obsoletely angulated in the middle, constricted and deflexed in 

 front. Aperture very oblique, nearly circular; peristome simple, 

 margins approximating, the upper one expanded, basal reflexed. 



Alt. 7, greater diam. 14, lesser 12 mill. (Pfr.) 



Cambodia. 



H.guinaria (typog. err.) PFR. P. Z. S. 1861, p. 195. H. quinaria 

 PFR. Monogr. v, p. 380. 



The shape of the aperture seems different from the other species 

 grouped here. 



H. CONDORTANA Crosse &-Fischer. PI. 31, figs. 23, 24. 



Shell umbilicated, subdepressed, rather thin, roughened with very 

 short, close hairs (setse); subdiaphanous, fulvous ; spire little ele- 

 vated. Whorls 5, a little convex, the last descending in front, sub- 

 angulated around the moderate, funnel-shaped umbilicus. Aperture 

 little oblique, elongate-lunar ; peristome white, shining, margins 



