HELIX-PAPUINA. 33 



umella sloping, nearly straight, triangularly dilated, forming an 

 angle with the basal lip. 



Alt. 32, greater diam. 18, lesser 13 mill. (Ad.') 



Island of New Britian. 



Geotrochus Fergusoni AD., P. Z. S. 1872, p. 614, t. 42, f. 14. 



Nearly allied to H. turris, but imperforate, smaller, thinner, more 

 acutely keeled. 



H. STEURSIANA Shuttleworth. Unfigured. 



Shell nearly-covered perforate, acutely conical, trochiform, thin, 

 subdiaphanous, very acutely carinated ; reddish-corneous, covered 

 with very fugacious epidermis ; delicately striated, and having very 

 delicate spiral lines. Spire much elevated, apex papillar; whorls 8, 

 flat or subconcave in the middle, the last whorl flat on the base ; 

 suture hair-like, subimpressed, margined with tawny. Aperture 

 very oblique, triangular- ax-shaped ; peristome rosy, upper margin 

 expanded, channelled and beaked at the carina, basal margin 

 reflexed, callous, thickened, reflexed at the columella, covering the 

 perforation. Columella arcuate, furnished with a white tooth-like 

 callus inside. Alt. 30, greater diam. 40, lesser 35 mill. (Shutt.") 



Amboyna. 



H. steursiana SHUTTLW., Bern. Mittheil. 1852, p. 200. PFR., 

 Monogr. iii, p. 179. 



(7). GROUP OF H. VITREA. 



Umbilicated ; depressed, acutely carinated; aperture angular. 



Moluccas and New Guinea. 



H. VITREA Ferussac. PI. 12 figs. 35, 36. 



Shell very narrowly umbilicated, depressed pyramidal, acutely 

 keeled, rather thin, closely irregularly striatulate, minutely gran- 

 ulated, scarcely shining, isabelline-whitish, with a very narrow per- 

 ipheral band ; spire conoidal, apex sub-globose ; whorls 4, a little 

 convex, the suture shallow ; last whorl slightly and nearly equally 

 convex above and below, the keel minutely crenulated ; obtusely an- 

 gulated around the umbilicus, in front descending a little below the 

 carina ; aperture slightly oblique, trapezoidal-semiovate ; peristome 

 expanded, thin, pale-roseate or white, dilated at the insertion of the 

 columella. Alt. 14i, greater diam. 27, lesser 21 mill. (Mts.) 



Islands of Moti, Ternate and Gilolo, Moluccas; Port Dorey and 

 Amberbaki, New Guinea. 

 3 



