HELIX-HELICOPHANTA. 63 



ly oval-lunar, somewhat pearly and of a livid whitish-brown inside, 

 and shows, by its transparence, the stronger girdles of the outside. 

 Peristome somewhat thickened, narrowly reflexed, soiled whitish, the 

 terminations united by a thin callus. Columellar margin dilated, al- 

 most wholly closing the umbilical chink. 



Alt. 37, greater diam. 63, lesser 49 mill. 



Madagascar. 



H. guestleriana CROSSE. Journ. de Conchyl. 1868, p. 268, t. 9, f. 

 4. 



The above description is from the original one of Crosse. The 

 species (which has not been seen by English authors), is very 

 similar to H. bicingulata, but differs, apparently, in the less oblique 

 mouth, more globose body-whorl, and lack of granulation upon the 

 columellar lip. 



H. BICINGULATA Smith. PI. 11, figs. 34, 35. 



Shell large, ovate, ventricose, imperforate or narrowly rimate, light 

 olive-brown above, darker brown towards the lip, with the lower sur- 

 face beneath the periphery still deeper in tint, encircled by two dark 

 brown, slightly raised narrow bands, one at the periphery, the other 

 and more distinct one above it. Spire depressed, convex, only a lit- 

 tle raised above the body-whorl. Volutions 4, very rapidly increas- 

 ing, convex, separated by a deepish suture ; two upper ones striated 

 by simple arcuate lines of growth, the third coarsely granular, the 

 lines of growth being but feebly expressed ; the last whorl very large, 

 much descending in front, granular at its commencement, the gran- 

 ules gradually disappearing and replaced by d'ose, oblique, short in- 

 dentations, also exhibiting 5 or 6 nearly obsolete concentric ridges 

 above the upper brown zone, and 2 or 3 between it and the lower one, 

 the lines of increase being more distinct upon this than the preced- 

 ing whorl. Lower surface swollen around the umbilical region, 

 marked with arcuate lines of growth and oblique, close, short inden- 

 tations like the upper surface, rounded at the periphery. Aperture 

 obliquely elongate, bluish-lilac within. Lip whitish, expanded, re- 

 flexed. Columella thickened, arched forward a trifle just beneath 

 the umbilicus, very granular, expanded and reflexed over the per- 

 foration, sometimes not quite closing it, united to the outer lip by a 

 very thin granulated callosity, coating the whorl within the aperture. 

 (Smith.) 



Greatest diam. 76, smallest 58, height, (resting on its base) 35 



mill. 



Ekongo, Southeast Madagascar. 



