82 HELIX. 



Comparisons should also be made with Trochomorphoides of Nevill, 

 type H. acris Bens., and Ganesella Blanf., type H. capitium Bens. 

 These groups having been monographed by Tryon in Vol. Ill of the 

 MANUAL, 1887, no course is open to me but to include the species 

 liere. 



Bulimus sphceroconus Pfr., and some other species should have 

 been placed in Satsuma, and there are also a number of Philippine 

 Island species likewise belonging to that characteristically east 

 Asiatic section. 



H. PERAKENSIS Crosse. PL 18, figs. 44, 45. 



Shell narrowly umbilicated, turrited-conic, trochiform ; slightly 

 subobliquely striatulate ; rather thin, subtranslucent, whitish, having 

 a narrow chestnut zone immediately above the suture ; spire rather 

 elongated, the apex rotund, sutures impressed. Whorls 6, nearly 

 flat, the embryonic earlier 2 smooth, corneous ; the last whorl shorter 

 than the spire (last whorl and spire having the ratio of 4 : 7) ; last 

 whorl acutely carinated at the periphery, the carina brown, the base 

 nearly flat. Aperture subquadrate ovate, white inside, showing by 

 transparence the brown line at the carina. Peristome simple, 

 shortly reflexed, white, margins separated, the columellar margin 

 short, straight, outwardly dilated and covering a third of the um- 

 bilicus ; basal margin subarcuate ; outer lip subangular at the carina, 

 narrowing above toward the insertion. 



Alt. 11, greater diam. 10, lesser 9 mill. (CrseJ) 



Perak. 



H. ( Getrochm) perakensis CR., Journ. de Conchyl. 1879, p. 199, 

 t. 8, f. 4. 



Var. SUBPERAKENSIS Pilsbry. PL 18, figs. 46, 47. 



Shell umbilicated, turrited-conic, thin. Whorls 7-7 , the earlier 

 convex, forming an obtuse apex ; last whorl carinated, convex 

 beneath, slightly descending in front. Surface finely obliquely 

 striatulate. Aperture oblique, outer lip narrowly expanded, 

 columellar lip broadly dilated. 



Alt. 11, greater diam. 10, lesser 9 mill.; oblique alt. of aperture 

 51, width 7 mill. 



Tonquin. 



Differs from perakensis in the blunter carina, more convex base, 

 and greater number of whorls. The specimens being dead I am not 



