228 HELIX-OBBA. 



Conch. Icon. f. 129. HIDALGO, Journ. de Conchyl. 1887, p. 102. 

 MARTENS, Mai. Bl. 1872, p. 171 (varieties). Helix grayana PFR., 

 Symbol* ii, p. 29. H. grayi HOMER. & JACQ., Voy. Pol Sud Moll., 

 t. 7, f. 18-21. H. scabrosa FER., Hist., t. 63, f. 1, 2. Obbina mar- 

 ginata SEMPER, Phil. Archip., Landmoll., ii, p. 127. H. sororcula 

 MARTENS, Ostas. Zool., Landschn., p. 294, t. 17, f. 4 (not of Ben- 

 oit). H. devincta TAPPARONE CANEFRI, Ann. Mus. Civ. Geneva, 

 xx, p, 156, 1884. 



May be known from other species having no tooth on the basal 

 lip by its color-pattern, and the microscopic sculpture of the upper 

 surface of the last whorl. 



Von Martens has discussed the variations and geographic range 

 of this species in Malak. Blat. 1872, p. 171. 



Var. SORORCULA Martens. PI. 57, figs. 94, 95, 96. 



Narrowly umbilicated, lenticular, acutely carinated, delicately 

 striated, rather shining, whitish, painted with 3-5 narrow pale 

 reddish bands ; spire short, conic, obtuse. Whorls scarcely 4, plane, 

 the last slightly and equally convex above and beneath, in front 

 abruptly and deeply descending ; aperture subhorizontal, subovate, 

 its outer angle rather acute ; peristome thin, narrowly expanded, 

 whitish, margins approximating, joined by a thin callus. (Mts^) 



Alt. 8-9, greater diam. 17-19 mill. 



Manado, northern Celebes. 



Smaller than H. margijiata, with narrower umbilicus and less 

 developed parietal callus, but scarcely, it seems to me, to be sepa- 

 rated specifically. Tapparone Canefri, however, considers it a dis- 

 tinct species. 



Var. GRISEOLA v. Moll. Shell a little smaller than the type, um- 

 bilicus wider, color gray-yellowish, bands narrower, last whorl at 

 aperture suddenly, vertically deflexed ; aperture horizontal, per- 

 istome continuous, free above. 



Alt. 10, diam. 26 mill.; alt. 8, diam. 21 mill. 



Mts. of Zebu and Siquijor, Philippines. 



This is Obbina gallinula Moll., J. D. M. Ges. xiv, p. 271, not of 

 Pfr. See Bericht Senckenb. naturforsch. Ges. 1890, p. 218. 



H. KOBELTIANA Pfeiffer. PI. 56, figs. 80, 81. 



Shell umbilicated, orbicular-depressed, rather lens-shaped, rather 

 thin, obliquely striate and very minutely granulated (seen under a 



