186 PROCEEDINGS OF THE ACADEMY OF [1890. 



NEW EAST INDIAN LAND SHELLS. 

 BY H. A. PIL8BRY. 

 Helicina Dentoni Pilsbry. 



Shell of a globose-conical form, but acutely keeled at the circum- 

 ference ; solid ; opaque-white, with dark red inner whorls and milk- 

 Avhite apex. Surface slightly shining, showing under a lens numer- 

 ous (about 14 on body-whorl) low, indistinct, spiral riblets. The 

 spire is conical, nearly straight-sided ; apex white ; the next two or 

 three whorls are a rich dark red color. There are 41 whorls, very 

 little convex, the last rather rounded but with an acute keel. 

 Aperture half-round, dark reddish orange inside ; lip expanded, 

 light salmon-colored. The pad at the umbilical region has a glassy, 

 faint bluish appearance. 



Alt. 7, greater diam. 84, lesser 7? mm. 



Oblique alt. of aperture 4i, greatest width 42 mm. 



One of the specimens has obscure, irregular, reddish spots on the 

 upper surface of the last and next earlier whorls. The species does 

 not appear in the Monographs, nor in the more recent publications 

 of Tapparone-Canefri (Ann. Mus. Civ. Genova) and others. It is 

 named in honor of Mr. William Denton, who collected the speci- 

 mens in New Guinea. 

 Nanina Kuschenbergeri Pilsbry. 



Shell large, depressed, thick and solid, rudely striate, deeply and 

 perspectively umbilicated. 



Solid and strong, opaque. The specimens are dead, lusterless and 

 destitute of epidermis, of a dirty-Avhite color with either (1) a single 

 narrow peripheral brown girdle, the umbilicus brown inside, or (2) a 

 broad brown girdle encircling the middle ofthe whorl, or (3) the up- 

 per surface of the last Avhorl brown except for a light girdle just 

 above the periphery, below which there is a broad zone, its lower 

 edge fading out on the base, the periphery itself marked by a 

 narrow darker band ; in all the forms the umbilicus is brown in- 

 side and the whorls of the spire light, the apex somewhat rufous. 

 The surface has very coarse and uneven, irregular, oblique strias 

 above ; they are weaker below ; and under a lens, close incised 



