408 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



and reflected, while the columella has a twist that gives it almost the 

 appearance of having a tooth a little nearer to its base than its 

 insertion. 



Sowerby described this species from the Cuming collection, and he 

 cites Puerto Galera, Island of Mindoro, as the type locality. I col- 

 lected specimens on Medio Island, which is in Puerto Galera, that in 

 every way correspond with Sowerby's form, and I am inclined to 

 believe that his shell came from Medio Island. On the other hand, 

 the shells that I collected to the east of the peninsula on which Puerto 

 Galera is located, namely, Varadero Bay, yielded a much more 

 elevated form, to which I have given the subspecific name varaderoana. 

 The two races may be distinguished by the following key: 



KEY TO THE SUBSPECIES OF COCHLOSTYLA (COCHLOSTYLA) HYDROPHANA 



Shell decidedly elevated varaderoana 



Shell not decidedly elevated hydrophana 



COCHLOSTYLA (COCHLOSTYLA) HYDROPHANA VARADEROANA Bartsch 



Plate 99, Figure 3 



1932. Cochlostyla (Cochlostyla) hydrophana veroderoana Bartsch, Journ. Wash- 

 ington Acad. Sci., vol. 22, p. 336. 



Shell elongate-ovate. The nuclear whorls and the first postnuclear 

 whorls white; the later ones with a very narrow light zone at the 

 summit followed by a darker band immediately below the summit, 

 winch sometimes is pale, at other times quite dark chocolate-brown. 

 There is also a brown band immediately posterior to the periphery 

 and another on the middle of the base, and a conspicuous dark col- 

 umellar area. These are all separated by brown zones of flesh-color 

 in the decorticated specimens, or where the periostracum is present 

 by an olivaceous or olivaceous-waxy color band. The interior of the 

 aperture and peristome are white. 



The type (U.S.N.M. no. 313619) was collected by me at Varadero, 

 Mindoro. It has 5.1 whorls and measures: Length, 36.8 mm; greater 

 diameter, 28.7 mm; lesser diameter, 26.0 mm. 



Seven topotypes (U.S.N.M. no. 256166) yield the following meas- 

 urements: 



