LAND SHELLS OF GENUS OBBA FEOM MINDORO 355 



OBBA SUBHORIZONTALIS RADCUFFEI, new subspecies 



Plate 90, Figure 3 



While collecting on a hill bordering the shore of Mansalay Bay, 

 Mindoro, I found an Obba that resembles 0. subhorizontalis in such 

 a remarkable way that had it come from the island of Sibuyan, the 

 type locality for the typical race, I would unhesitatingly have referred 

 it here. The separation of locality has caused me to subject it to the 

 most critical examination, with the result that I find that the base of 

 this shell is a little less rounded than that of the typical subspecies, 

 and the umbilicus is a little wider. There are also spiral striations 

 present on the anterior half of the base and in the umbilicus, which I 

 have not been able to observe in the typical race. I believe that these 

 are good and sufficient characters to consider this distinct from Obba 

 subhorizontalis subhorizontalis. 



Type.— The type, U.S.N.M. No. 256501, has 4.3 whorls, and meas- 

 ures: Height, 12 mm; greater diameter, 27.8 mm; lesser diameter, 

 22.6 mm. 



Remarks. — I take pleasure in naming this race for Dr. Lewis 

 Radcliffe, deputy commissioner of the United States Bureau of 

 Fisheries, who was a member of our scientific staff during the United 

 States Bureau of Fisheries Albatross Expedition to the Philippine 

 Islands. 



OBBA SARCOCHROA ILOGANA, new subspecies 



Plate 90, Figure 5 



The shell is broadly conic and has a decided peripheral angle. The 

 umbilicus is half closed by the reflected inner lip. The general 

 groimd color is soiled flesh-color. On the upper surface there is a 

 slender median brown thread, which extends from the end of the nu- 

 clear whorls to the last turn; on the latter it is absent. In addition to 

 the median brown band, the first 2.3 postnuclear whorls are marked 

 with a second less conspicuous spiral zone a little below the summit. 

 The first 1.5 postnuclear whorls are also much darker than the rest. 

 In addition to the spiral bands, the whorls are more or less mottled 

 with scattered faint blotches and axial streaks of brown on the upper 

 surface. The base is uniformly soiled flesh-color, while the peri- 

 stome is pale brown tinged with buff. The nuclear whorls are marked 

 by faint incremental lines and spiral striations. On the postnuclear 

 whorls both of these elements become a little intensified except on 

 the last whorl, where enfeebling again takes place, at least in the spiral 

 striations. The basal third of the penultimate whorls also shows an 

 irregular scratchy crisscross sculpture, which gives to that portion of 

 the whorl a somewhat malleated appearance. The base is slightly 

 rounded and marked by incremental lines and rather regularly spaced, 



