460 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



peristome is edged with brown. Figure 4 has a very dark brown 

 peripheral band and a dark brown columellar patch. In figure 6 a 

 brown columellar patch is present, and the peripheral band is merely 

 indicated. Figure 11 has both peripheral band and columellar patch, 

 while in figure 12 they are merely indicated. 



In plate 105 the ground color again varies from orange-red to brown. 

 In this group the shells are ail conspicuously spirally banded, the bands 

 varying from narrow to broad and ranging from pale orange-brown to 

 dark brown. The periostracum is again either plain or fulgurated. 

 Figures 8, 9, 10, and 11 are light tipped; the rest are dark tipped. In 

 figure 4 we have a reversal of the usual coloration, and the umbilical 

 area is light instead of dark. In figure 1 there is a similar indication, 

 although here the umbilical area is pale orange-yellow. Likewise in 

 figures 2, 5, and 10. In figures 6, 7, 9, 11, and 12 the umbilical area is 

 dark. The rest of the color phases are so well shown in our figures 

 that there is no need of further explanation. I wish only to emphasize 

 that in this mutating complex there is a remarkable range of variation. 



COCHLOSTYLA (PROCHILUS) species? 



Plate 107, Figures 11-16 



A scant collection of shells, suggesting Cochlostyla (Prochilus) 

 virgata but with white or pale yellow periostracum, unicolor or banded 

 with heavy and broadly reflected lip, is before me. They come from 

 southern Mindoro, some from Bongabon, Bulalacao, and Mangarin, 

 and some collected by the Exploring Expedition from Ilin Island. 



When more specimens with definite locality labels come to hand we 

 may have to resurrect Cochlostyla (Prochilus) dryas Broderip and con- 

 sider it as a distinct species, probably with several zoogeographic 

 races. Until then, however, the matter entails too many guesses to be 

 so treated, and I prefer to pass it over for the time being. Attention 

 should be called, however, to Broderip's statement in the Proceedings 

 of the Zoological Society of London, 1841, page 95, that "Mr. Cuming 

 informs us that the animal of this elegant shell * * * (Cochlostyla 

 (Prochilus) dryas) was ash colored, darker above." On the same page 

 he says of Cochlostyla (Prochilus) sylvanus that "Mr. Cuming informs 

 us that the animal is reddish brown." Cochlostyla (Prochilus) dryas 

 was reported by Broderip as coming from Mansalay, which would put 

 it within the range of the present element. 



The specimens shown on plate 106, figures 13 and 14, come from 

 Bulalacao; figures 7, 11, and 12 from Mangarin. 



COCHLOSTYLA (PROCHILUS) CERINA Bartsch 



Plate 107, Figure 9 



1932. Cochlostyla (Prochilus) cerina Bartsch, Journ. Washington Acad. Sci., vol. 

 22, p. 338. 



