COCHLOSTYLA-HELICOSTYLA. 191 



The contour of this species throws it into the group of 0. meta- 

 formis. In the case of this, as well as the other Australasian species 

 of Cochlostyla, it is highly desirable that the genitalia be examined. 



(4). Group of C. fenestrata. 



The shell in this group is notably compact and solid, showing close, 

 fine spiral stride under a lens ; and hydrophanous cuticle is present. 

 The mouth is rather small, the outer lip decidedly thickened ivithin with 

 white callus; the columella is pure white, and decidedly thick, often 

 truncated at base. 



The limits of this group are doubtful, v. Mollendorff including in 

 it C. bruguieriana, crossei, roissyana, fuliginata, montana, curta, 

 fenestrata, solida, dimera, jonasi. A careful study of the whole 

 matter has inclined me to believe that bruguieriana cannot well be 

 sundered from carbonaria and other species of Axina, and I am not 

 certain that solida and crossei should not also be included there. 

 C. roissyana and dimera had better be left in the Cochlostyla^ hypo- 

 melanice. Mollendorff's citation of C. jonasi in this connection is 

 evidently due to Pfeiffer's mistaken reference in the Monographic, 

 to the figures of the plate in Kiister, the figures of dimera being 

 given in error. On the other hand, I feel impelled to place in the 

 present group a number of shells heretofore classed under Ortho- 

 stylus, such as C. leucophcea and C. mus ; but until the entire group 

 can be studied in the light of a greater mass of material we will not 

 be able to speak definitely upon these obscure group relations. 







C. MONTANA Semper. PI. 58, figs. 93, 94. 



Ini perforate, turbinate-globose or turbinate, solid, chestnut colored 

 covered with a streaked hydrophanous cuticle, ornamented with two 

 white bands, one at periphery, the other at the suture, and close 

 whitish lines beneath. Spire conoidal, apex rubescent, obtuse. 

 Whorls d-2, a little convex, the last convex and denuded on the base. 

 Columella excavated, dentate, white. Aperture lunate-oval, milk- 

 white within ; peristome narrowly thickened, edged with black in- 

 side. Alt. 29, greater diam. 25, lesser 21 mill. (&) 



Foot of Monte Data, Mancayan, Luzon. 



C. montana SEMP., Reis., p. 194, t. 9, f. 4. 



