436 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



straw color through yellow and pale orange-brown to grayish brown. 

 The color of the shell from which the periostracum has been removed 

 may be completely white. In all the specimens before me, regardless 

 of the race involved, except Cochlostyla (Hypselostyla) cincinnijormis 

 lubanensis, there is an indication of a dark columellar area on the 

 base. The intensity of this coloration varies from pale brown to 

 almost black. A peripheral dark zone is also present and is even 

 indicated weakly in lubanensis. The extent of this peripheral zone 

 varies in the different races; sometimes it constitutes a narrow line, 

 while in other races it forms a broad band, and the intensity of colora- 

 tion is also variable. In some of the races it is very pale brown, while 

 in others it is almost black. What I have said of the peripheral band 

 applies also to the dark band at the summit, which is present in all the 

 races and almost obsolete in lubanensis. As a rule the intensity of 

 coloration expressed, whether pale or dark, holds good for all the 

 dark zones, whether circumbilical, peripheral, or the band at the 

 summit. The light zones between the dark bands vary in intensity 

 from white to flesh color to pale straw color to pale orange-brown. 

 The nuclear whorls in most of the races are white; in some, however, 

 they are dark, and it will be interesting to see whether the dark-tipped 

 and light-tipped forms represent elements taken from the same col- 

 ony (that is, stock) or distinct colonies. 



The distribution of the species extends from Cabra Island on the 

 north through Lubang, Golo Island, to northern Mindoro, breaking 

 up into local races, several of which are present on Lubang. 



KEY TO THE SUBSPECIES OF COCHLOSTYLA (HYPSELOSTYLA) CINCINNIFORMIS 



Columellar area of base with brown patch. 

 Light area of base cinnamon-rufous. 



Dark bands of base and spire cinnamon-rufous ultima 



Dark bands of base and spire not cinnamon-rufous. 



Dark bands of base and spire brownish black demesana 



Light area of base not cinnamon-rufous. 



Light area of base flesh-color menagei 



Light area of base not flesh-color. 



Light area of base straw-color or yellowish orange. 



Shell rather slender cincinniformis 



Shell rather stout. 



Whorls well rounded guntingana 



Whorls flattened cabrasensis 



Columellar area of base without brown patch lubanensis 



COCHLOSTYLA (HYPSELOSTYLA) CINCINNIFORMIS ULTIMA (Clench and Archer) 



Plate 101, Figure 2 



1931. Helicostyla cincinniformis ultima Clench and Archer, Occ. Papers Boston 



Soc Nat. Hist., vol. 5, pp. 335-336, pi. 17, fig. 4. 



1932. Cochlostyla (Hypselostylus) cincinniformis ultima Bartsch, Journ. Wash- 



ington Acad. Sci., vol. 22, p. 337. 



