COCHLOSTYLA OF MINDORO PROVINCE 479 



Although I have only the type of this race before me, I believe that 

 it is a perfectly well-recognized subspecies, differing from typical 

 Cochlosiyla (Chrysallis) jayi jayi in its much smaller size and its wide 

 zoogeographical separation from the typical form, and that subse- 

 quent material will substantiate my contention. 



COCHLOSTYLA (CHRYSALLIS) JAYI CAMORONGANA Bartsch 



Plate 109, Figure 7 



1932. Cochlosiyla (Chrysallis) jayi camorongana Bartsch, Journ. Washington 



Acad. Sd\, vol. 22, p. 340. 



1933. Hclicostyla (Chrysallis) ustulata Clench and Archer, Papers Michigan 



Acad. Sci., Arts, Letters, vol. 17, p. 551, pi. 58, fig. 6. 



Shell pupoid, almost cylindro-conic. The nuclear whorls are of 

 bluish color or dark chocolate-brown. The early postnuclear whorls 

 are chestnut-brown, while the last turn is of almost blackish-brown 

 ground color. The periostracum covering the postnuclear whorls is 

 variegated with axial streaks, spots, dashes, or fulgurations of yellowish 

 buff. The aperture is bluish white, and the broadly expanded and 

 reflected peristome is almost black with a very bright iridescent 

 bluish reflection. The triangle of the inner edge of the columella near 

 its insertion is bluish smoky, while the parietal wall is covered with a 

 transparent callus. Nuclear whorls 3, well rounded; the first smooth, 

 the next showing incremental lines, while the last shows the sculpture 

 of the postnuclear whorls. The postnuclear whorls are appressed at 

 the summit and marked by low, rounded, closely approximated, 

 somewhat irregularly developed lines of growth and numerous pale ill- 

 defined spiral striations. In addition the usual fine microscopic criss- 

 cross sculpture that cuts the lines of growth obliquely, both protrac- 

 tively and retractively, is present. The sculpture of the spire is also 

 characteristic of the base. The aperture is oblique, subauricular; the 

 inner lip is reflected over the umbilicus at its insertion. 



The type (U.S.N.M. no. 313620) was collected by Pedro de Mesa at 

 Camorong, Municipality of Abra de Hog, northern Mindoro. It has 

 7.4 whorls and measures: Length, 73 mm; greater diameter, 28.8 

 mm; lesser diameter, 25.8 mm. 



A series of topotypes, all collected by Mr. de Mesa, yields the 

 measurements shown on the following page. 



