410 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



between it and the median basal band is flesh-color. The anterior of 

 the aperture is bluish white, which is also the color of the somewhat 

 expanded outer lip and columella. 



A series of specimens, mostly young and imperfect, was collected 

 by me on Medio Island, Puerto Galera, during the Albatross Expedi- 

 tion to the Philippines. 



The specimen described and figured (U.S.N.M. no. 255908) has 5 

 whorls and measures: Length, 32.6 mm; greater diameter, 28.6 mm; 

 lesser diameter, 24.7 mm. 



Two additional individuals under the same registry, from the same 

 source, have each 5 whorls. They measure: Length, 32.4 and 35.7 

 mm; greater diameter, 27.4 and 29.3 mm; lesser diameter, 23.3 and 

 25.5 mm, respectively. 



This race differs from Cochlostyla (Cochlostyla) hydrophana varader- 

 oana in being broadly ovate. 



Subgenus Cochlodryas Martens 



In this subgenus the shell is subglobular, sometimes a little more 

 depressed and sometimes a little more elevated. The periostracum is 

 very thin, usually a mere film, and frequently absent, being easily 

 worn off. All the species are marked with green. The shell may be 

 unicolor or banded with spiral zones of green or brown or a combina- 

 tion of these. A columeilar dark patch may or may not be present. 

 A narrow white thread is present at the summit. The aperture varies 

 from subcircular to subquadrate. 



Type: Cochlostyla (Cochlodryas) polychroa (Sowerby). 



COCHLOSTYLA (COCHLODRYAS) FLORIDA (Broderip) 



The shell is broadly ovate and rather flat, with a blunt apex. The 

 surface is covered by a thin dull periostracum, which is usually some 

 shade of green or olive, though in some forms brown or pale olivaceous- 

 waxy. The early whorls may be white or brown, and the ground color 

 of the succeeding turns, when the periostracum is removed, is white. 

 The shell may be unicolor on its exterior or it may have spiral bands. 

 There may be a zone below the summit, another at the periphery, and 

 one between the two, and there is usually a dark area about the colu- 

 mella though in Cochlostyla (Cochlodryas) helicoides this element is 

 missing. Any one of the brown bands may disappear. In addition 

 to these brown bands, there is always a narrow white zone at the 

 summit immediately above the first brown band. The interior of 

 the aperture and the peristome are white. This species, as far as 

 known, appears to be confined to eastern Mindoro and breaks up into 

 a series of races, which are here defined. 



