HELIX-OBBA. 229 



lens), irregularly malleate-impressed, subunicolored brown, with one 

 obscure obsolete band beneath. Spire very shortly conoid, apex 

 obtuse ; sutures simple, linear ; whorls 4, flat, the last very shortly 

 descending in front. Periphery acutely compressedly carinated, 

 the base a little convex around the narrow umbilicus (which is 

 about one-ninth the diameter of the shell in width.) Aperture very 

 oblique, ax-shaped, outer margin acutely angled, peristome whitish, 

 margins scarcely converging, joined by a rather thin callus; upper 

 margin narrowly expanded, the outer angle a little turned upward ; 

 basal margin thickened, reflexed, horizontal in the middle, ascend- 

 ing at both ends, dilated at the umbilicus. 



Alt. 8-8*, greater diam. 23-25, lesser 20-22 mill. (P/r.) 



Island of Ceram. 



H. Kobeltiana, PFR. Mai. Bl. 1871, p. 124; Monogr. v, p. 456 ; 

 Novit. Conch, iv, p. 73, t. 121, f. 12, 13. MARTENS, Mai. Bl. 1872, 

 p. 172. 



A form very like H. marginata, but darker, more obviously sculp- 

 tured ; whorls flatter, the last one much less descending in front, 

 terminations of the peristome more distant, parietal callus slighter ; 

 the aperture is more angled at the carina. The locality given is far 

 removed from that of the marginata. 



H. PARMULA Broderip. PI. 57, figs. 85, 86, 87 ; pi. 65, figs. 73, 

 74, 75. 



Shell umbilicated, very much depressed, with an acute, peripheral 

 keel ; pale brown, with a narrow chestnut band above and one be- 

 low ; the two sides of the knife-like keel brown, its edge white. 

 Surface delicately obliquely striated, and showing in places, under 

 a very 'strong lens, an excessively minute granulation. Surface 

 coarsely wrinkled for a short distance behind the lip. 



The shell is rather thin and light, like others of the marginata 

 group. It is discoidal, pale colored ; the outer part of the whorl, 

 behind the lip, is obliquely wrinkled. Whorls 4J-5. flat, the last 

 abruptly deflexed in front, a little contracted behind the basal lip. 

 Aperture nearly horizontal ; peristome continuous, white, outer lip 

 expanded, angled, basal lip reflexed, not toothed within. 

 Alt. 13, greater diam. 43, lesser 37 mill, (typical.) 

 Alt. 10, greater diam. 35, lesser 29 mill. (Smaller form.) 

 Is. Negros and Zebu (Cuming) ; Zamboango, Mindanao, and Vis- 

 ayas Is. (Hidalgo) ; Isl. of Siquijor, Philippines. 



