OBBA. 109 



(Group of 0. marginata.") 



O. bigouia Fer., vi, 226. O. kobeltiaua Pfr., vi, 228. 



wnnarensis Pfr., ol'nn. O. parmula Brod., vi, 229. 



bizonia H. & A. Ad. discu* Dh., vi, 230. 



O. marginata Mull., vi, 227. f. obscura Mlldff., vi, 230. 



<jmyana Pfr. f. clevata Mlldff, vi, 230. 



grayi Hombr. & Jacq. f. trochoidea Mlldff, vi, 230. 



*c<ibro*(i Fer. O. bustoi Hid., vi, 230. 



v. griseola Mlldff, vi, 228. O. saranganica Hid., vi, 230. 



v. sororcula v. Mart., vi, 228. O. kochiana Mlldff, vi, 231. 



devinda Tap. Can. O. bulacaneusis Hid., vi, 226. 



(Group of 0. horizontalis.^) 



O. horizontalis Pfr., vi, 232. O. lasallii Eyd., vi, 233. 



O. reeveana Pfr., vi, 233. meretrix Sowb. 



O. columbaria Sowb., vi, 234. 



Subgenus? OREOBBA Pilsbry, 3894. 



Janira ALBERS, Die Heliceen, 1850, p. 124, only species H. codo- 

 nodes. Not Janira Leach, 1813 (Crustacea), of Oken, 1815 (acale- 

 pha) or of Schumacher, 1817 (Pecten~). 



Shell globose-conoidal, bullet-shaped, composed of about 5 whorls 

 which are carinated in immature shells; the embryonal portion not 

 differentiated ; last whorl deflexed in front. Surface shining, micro- 

 scopically spirally striated. Aperture truncate-rounded ; entire lip 

 well reflexed, at the columella expanded partly over the narrow 

 umbilicus, and armed with a callous tooth on the inner edge. Type 

 H. codonodes Pfr., pi. 19, fig. 11. 



Animal unknown. 0. codonodes inhabits the Nicobar Islands. 

 It resembles the Philippine Island group Phcenicobiusin contour, but 

 not in texture or minute sculpture, nor in the apical whorls. The 

 sculpture is like that of the Obba horizontalis group. Of the two 

 species I have seen only codonodes. A knowledge of the anatomy 

 is necessary to the exact location of this group in the system. It 

 cannot, in my opinion, be united to Phvcnicobius. 



O. codonodes Pfr., vi, 236. O. camelus Pfr., vi, 237. 



