COCHLOSTYLA OF MINDORO PROVINCE 397 



COCHLOSTYLA (CALOCOCHLEA) ROISSYANA LAYMANSA Bartsch 



Plate 96, Figures 4-6 



1851. Helix roissyana Reeve, Conchologia iconica, pi. 18, fig. 73a. 



1887. Cochlostyla roissyana Hidalgo, Journ. Conchyl., vol. 35, p. 146; in part. 



1896. Cochlostyla roissyana var. Elera, Catalogo sistematico de toda la fauna de 



Filipinas, vol. 3, p. 576. 

 1901. Cochlostyla roissyana var. d Hidalgo, Obras malacologicas, p. 465, pi. 51, 



fig. l;pl. 122, fig. 4?. 

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



Acad. Sci., vol. 22, p. 336. 



Shell rather small, globular, covered with a thin periostracum, 

 which is the color of the blush of a green plum. In all our specimens 

 there is a zone of brown at the summit and a dark area about the 

 umbilicus. In addition to that there may be a supraperipheral band 

 and a band between the periphery and the base. In some of the 

 specimens the last whorl becomes gradually brown toward the aper- 

 ture. In such there is usually a zone of the ground color at the 

 periphery. 



The type (U.S.N.M. no. 313616) has 5.1 whorls and measures: 

 Length, 30.8 mm; greater diameter, 31.1 mm; lesser diameter, 26.7 mm. 



U.S.N.M. no. 255958 contains 17 topotypes, the perfect specimens 

 of which measure: 



This race coming from the western shore of Mansalay Bay can 

 easily be distinguished from the others by its pale greenish plum color. 



