218 HELIX-OBBA. 



black inside, the expanded lip white. Edge of the parietal callus 

 not elevated. 



This is a large shell, strong and solid, but rather thin ; low-coni- 

 cal above, convex beneath ; whorls ifearly flat, the periphery acute- 

 ly keeled. Whorls 4 5-, the inner two dark purplish-brown, convex,, 

 unicolored ; the rest of the whorls speckled and mottled ; last whorl 

 deeply and abruptly descending in front, having an interrupted 

 black band just above the keel ; interior of the umbilicus and a 

 streak back of the lip black. Aperture ax-shaped, nearly horizon- 

 tal, shining and black within ; peristome white, expanded, not 

 thickened, basal margin reflexed ; parietal wall coated with a shin- 

 ing black varnish. Umbilicus narrow, nearly concealed. 



Alt. 22-24, greater diam. 40-43, lesser 34-35 mill. 



Inland from Port Moresby, New Guinea, under the Astrolabe Mts* 



H. Goldiei BRAZ., Proc. Linn. Soc. K S. Wales, v, p. 637, 1880 ; 1. 

 c. ix, p. 804, 1884. Helix (Obba) oxystoma E. A. SMITH, Ann. & 

 Mag. N. H., 5th ser., 1883, p. 191. TAPPARONE CANEFRI, Ann.. 

 Mus. Civ. Genova, xix, p. 160. 



This beautiful species, now for the first time figured, can be com- 

 pared only with H. listeri. From that species it differs notably in 

 coloration, and the lack of a parietal cord of callus. It is most 

 curious to find a species of the typically Philippine Island group 

 Obbina in so distant a locality, and associated with such a totally 

 different snail-fauna. 



H. LISTERI Gray. PL 56, figs. 59, 60, 61, 62, 63, 64, 65, 66. 



Shell umbilicated, much depressed, lens-shaped, acutely carinated ; 

 very irregularly marbled and spotted with brown and white, having 

 one interrupted spiral brown band above and one below ; the base 

 white inside the lower band ; peristome continuous, basal lip more 

 or less obviously toothed in the middle. 



The shell is depressed, generally about equally convex above and 

 below, but sometimes low-conical above, or rarely flat there. The 

 periphery is acutely keeled, but often the last half of the body- 

 whorl is narrowed, the keel blunted, giving the shell an oblong 

 rather than circular form. It is thin but solid, rudely malleated, 

 obliquely criss-crossly wrinkled with coarse, irregular white wrinkles. 

 Whorls 4|, the first \\ corneous, smooth, convex; the following 

 flat ; last whorl abruptly descending in front, deeply constricted 

 behind the basal lip. Aperture horizontal, elliptical, dark within ; 



