62 HELIX-HELICOPHANTA. 



two-thirds of the whorl, which is marked above and below by rather 

 coarse wrinkles of growth; the whorl is encircled by numerous 

 girdles of a brown color and a trifle raised. The spire is low, con- 

 vex ; suture impressed ; whorls nearly 4?, rapidly increasing, the 

 first three forming the nuclear or embryonic shell, the last whorl 

 very large, descending in front, convex beneath, and impressed 

 around the narrowly rimate or imperforate axis. Aperture oval- 

 truncate, dark violet-bluish and with a silky luster inside. Per- 

 istome white, narrowly expanded all around, narrowly dilated at the 

 columellar insertion ; columellar margin smooth, not granulate ; 

 terminations of peristome connected by a thin callus which extends 

 inward on the penultimate whorl, and is conspicuously granulate. 



Alt. 50 greater diam. 77, lesser 58 mill. Greatest breadth of 

 aperture 54 mill. , 



Southeast Betsileo and Tanala country, Madagascar. 



H. ibaraoensis ANGAS, Proc. Zool. Soc. 1879, p. 728, t. 57, figs. 3, 

 4. SMITH, P. Z.'S. 1882, p. 381. 



This is a species of a dark chocolate color, light olive-yellow be- 

 tween the spiral dark girdles. The columellar and upper lips are 

 smooth, but the thin whitish callus which is spread upon the penul- 

 timate whorl within the mouth is studded with whitish granules. The 

 outer surface lacks those small oblique impressions or wrinkles so 

 characteristic of H. bicingulata and its varieties, and the columellar 

 lip is uniformly though slightly concave, not bending a little for- 

 ward or outward as in the If. bicingulata. The figure on my plate 

 is incorrect in showing the spiral girdles extending upon the penul- 

 timate whorl this portion being eroded and bandless in the speci- 

 men from which the drawing was made. 



H. GUESTIERIANA Crosse. PI. 9, figs. 18, 19. 



Shell narrowly subrimate, depressed, ovate-subglobose, rather thin, 

 scarcely ponderous, obliquely closely plicate-striate, spirally encir- 

 cled by unequal blackish-brown, very slightly raised girdles, on 

 an olive-fulvous ground. Spire obtuse, terminating in a rather flat 

 apex ; suture deeply impressed. Whorls of the spire 4, rapidly in- 

 creasing, the two first nearly smooth, the penultimate covered by a pe- 

 culiar, c^ose granulation, the last whorl descending, large, much in- 

 flated, granulated in the vicinity of the suture, then strongly malleated 

 as far as the umbilical region, which presents only low striae, and is of a 

 deeper color than the base. Aperture very oblique, diagonal, broad- 



