COCHLOSTYLA OF MINDORO PROVINCE 



489 



bands, which vary in size and regularity. The aperture is bluish 

 within; the peristome is pale brown, which is also the color of the 

 parietal callus. The surface of the shell is covered by a very thin 

 periostracum, which allows the markings referred to before to shine 

 through. Nuclear whorls 3, well rounded, smooth. The postnuclear 

 whorls are well rounded, very slightly narrowly shouldered at the 

 summit, and marked by retractively slanting, rounded, threadlike lines 

 of growth, which are closely approximated and of irregular strength. 

 The fine crisscross sculpture obliquely cutting the lines of growth is 

 very feebly expressed. This scupture also obtains on the base, where 

 fine, closely spaced, microscopic, feebly incised spiral lines are also 

 present. The periphery and base are inflated and well rounded. 

 The aperture is large, very broadly oval. The peristome of the outer 

 lip is thickened, expanded, and reflected. The peristome of the inner 

 lip is also thickened and expanded, particularly at its insertion, where 

 it continues over the parietal wall as a thick callus. The reflected 

 inner lip leaves a broad umbilical chink. 



This race differs from Cochlostyla (Chrysallis) rollei osborni in being 

 more conic and less definitely streaked. It differs from Cochlostyla 

 (Chrysallis) rollei vexator in being much larger, and from Cochlostyla 

 (Chrysallis) rollei nigra in being much lighter. 



The specimen described and figured is one of nine (U.S.N.M. no. 

 255868) collected by Col. Edgar A. Mearns on Mount Halcon, Min- 

 doro. It has 6.2 whorls and measures: Length, 75.6 mm; greater 

 diameter, 42 mm; lesser diameter, 34.2 mm. The other eight speci- 

 mens yield the following measurements: 



COCHLOSTYLA (CHRYSALLIS) ROLLEI OSBORNI Bartsch 



Plate 110, Figure 7 



1901. Cochlostyla rollei Hidalgo, Obras malacologicas, pp. 546-547 (in part), 



pi. 127, figs. 1, 2. 

 1932. Cochlostyla {Chrysallis) rollei osborni Bartsch, Journ. Washington Acad. 



Sci., vol. 22, pp. 340-341. 



