HELIX-OBBA. 281 



a narrow, little-elevated callus. Upper margin expanded, basal re- 

 flexed. Alt. 8, greater diam. 28, lesser 24 mill. (Hidalgo?) 



Sadajos, Isl. of Tablas, Philippines. 

 H. bustoi HID., Journ. of Conch. 1887, p. 100, t. 2, f. 3. 



Under a very strong lens most minute granulations are visible, as 

 in H. parmula, etc. 



H. SARANGANICA Hidalgo. PI. 60, figs. 10, 11. 



Shell narrowly umbilicated, convex-depressed, discoidal, carina- 

 ted, rather solid, obliquely striatulate, pale tawny, with five yellow- 

 ish-brown zones ; spire convex, apex obtuse ; whorls 4, planulate, 

 the last little wider than the next inner one, in front angularly 

 deflexed, scarcely convex above, sloping, at the lab rum subcom- 

 pressed, beneath convex in the middle, constricted at the aperture, 

 carina acute, white. Umbilicus profound, one-tenth the diameter 

 of the shell. Aperture horizontal, oblong; peristome simple, mar- 

 gins joined by a narrow callus, upper margin expanded, basal re- 

 flexed, obsoletely one-toothed in the middle. Alt. 12, greater diam. 

 35, lesser 30 mill. (Hidalgo.} 



Islet of Sarangani, south of Mindanao, Philippines. 



H. Saranganica HID., Journ. de Conchyl. 1887, p. 101, t. 2, f. 4. 



Described from a dead specimen, but apparently a distinct spe- 

 cies. It may, perhaps, belong to the group of If. horizontalis. 



H. KOCHIANA Mollendorff. PI. 59, figs. 43, 44, 45. 



Shell rather openly umbilicated, depressed, acutely carinated, 

 elegantly sculptured with rather distant riblets becoming evanes- 

 cent beneath, and decussating, most minute spiral lines ; pale cor- 

 neous-brown, encircled with 5 narrow bands; three above, one at 

 suture, one at carina, and a darker one midway ; two beneath, the 

 carinal one indistinct. Whorls 5, planulate, the last more convex 

 below, suddenly deflexed in front. Aperture nearly horizontal, 

 angular-elliptical, the peristome continuous, expanded, a little re- 

 flexed, labiate with white, brown margined outside. Alt. 13?, diam. 

 32 mill.; alt. 13, diam. 34 mill.; alt. 18, diam. 40 mill. (Mild/.') 



Medellin and Bantayan, Northern Zebu. 



Obbina kochiana v. MOLL., Nachrichtsbl. D. M. Ges. 1888, p. 88 ; 

 Bericht Senckenb. naturforsch. Ges. zu Frankfurt a. M., 1890, p. 

 216, t. 7, f. 10. 



The toothless basal lip combined with strong oblique riblets will 

 sufficiently distinguish this form. 



