COCHLOSTYLA OF MINDORO PROVINCE 391 



The present race can be distinguished from the dark race from Ilin 

 Island by its larger size and dark lip. 



COCHLOSTYLA (CALOCOCHLEA) ROISSYANA LUTEA (Pfeiffer) 



Plate 95, Figures 1-6 



1869. Helix roissyana var. Pfeiffer, Novitates conchologicae, vol. 3, p. 497, 



pi. 107, figs. 10, 11. 

 1876. Helix roissyana lutea Pfeiffer, Monographia heliceorum viventium, vol. 



7, p. 324. 

 1892. Cochlostyla roissyana lutea Pilsbry, Man. Conch., ser. 2, vol. 6, p. 152, 



pi. 30, figs. 23, 24. 

 1895. Helicostyla roissyana lutea Pilsbry, Man. Conch., ser. 2, vol. 9, p. 223. 

 1989. Cochlostyla roissyana lutea Mollendorff, Abh. Naturf. Ges. Gorlitz, 



vol. 22, p. 122. 

 1901. Cochlostyla roissyana var. c Hidalgo, Obras malacologicas, pt. 1, p. 465. 

 1901. Cochlostyla roissyana var. m Hidalgo, ibid., p. 466, pi. 122, fig. 2. 

 1910. Cochlostyla roissyana lutea Mollendorff, Kobelt, and Winter, Semper's 



Reisen im Archipel der Philippinen, vol. 10, pp. 204-205; in part. 

 1932. Cochlostyla (Calocochlea) roissyana lutea Bartsch, Journ. Washington 



Acad. Sci., vol. 22, p. 335. 



Ilin Island has a small race of Cochlostyla (Calocochlea) roissyana. 

 Quadras was the first one to point out that the yellow shell that 

 Pfeiffer described and figured in 1869 in his Novitates Conchologicae 

 came from Ilin Island. Four specimens before me, which undoubtedly 

 belong here, agree quite well with Pfeiffer's diagnosis, and they agree 

 so well with the host of material before me in shape, although this is 

 of extremely dark coloration, that I am led to believe that they prob- 

 ably represent only color phases of the Ilin Island race. I am there- 

 fore giving a description of both. The typical Cochlostyla (Calo- 

 cochlea) roissyana lutea figured by Pfeiffer is of orange color with a 

 light band a little distance below the summit, which bears a dark 

 band. Beginning with the next to the last whorl, the light zone more 

 and more covers the whorls until only a narrow suprasutural band 

 and a narrow zone of orange are present at the summit. The base is 

 also of orange color, with the columella and expanded peristome light 

 edged with an orange margin at the outer periphery. The dark shells 

 may be described as follows: 



Shell small, globular; nuclear whorls bluish white, the first postnu- 

 clear turn soiled flesh-color, the rest brown, usually with an incon- 

 spicuous broad median paler brown zone. Base brown. The entire 

 surface is covered by a dull pale grayish brown periostracum. The 

 interior of the aperture and columella are white; the peristome is 

 edged with dark brown. A light zone bordering the dark columellar 

 patch is seen on the parietal wall within the aperture. 



The specimens before me were collected by Pedro de Mesa on Ilin 

 Island, south of Mindoro. 



