COCHLOSTYLA OF MINDORO PROVINCE 423 



1859. Helix tenera Pfeiffer, Monographia heliceorum viventium, vol. 4, p. 199. 



1860. Helicostyla tenera Martens, Albers, Die Heliceen, ed. 2, p. 175. 



1868. Helix tenera Pfeiffer, Monographia heliceorum viventium, vol. 5, p. 268. 



1876. Helix tenera Pfeiffer, Monographia heliceorum viventium, vol. 7, p. 308. 



1877. Cochlostyla tenera Semper, Reisen im Archipel der Philippinen, pt. 2, vol. 



3, p. 195. 

 1887. Cochlostyla tenera Hidalgo, Jo urn, Conchyl., vol. 35, p. 143. 

 1892. Cochlostyla tenera Pilsbry, Man. Conch., ser. 2, vol. 7, pp. 179-180, pi. 



36, fig. 31. 

 1895. Helicostyla tenera Pilsbry, Man. Conch., ser. 2, vol. 9, p. 225. 

 1897. Cochlostyla tenera Hidalgo, Journ. Conchyl., vol. 44, pp. 260, 320, 331, 



332, 341, 351. 

 1901. Cochlostyla tenera Hidalgo, Obras malacologicas, pp. 462-463 (in part), 



pi. 38, fig. 4; pi. 50, figs. 1, 2; pi. 53, fig. 3. 

 1911. Cochlostyla (Cochlodryas) tenera Mollendorff, Kobelt, and Winter, 



Semper's Reisen im Archipel der Philippinen, vol. 10, pp. 250-251 



(in part), pi. 51, figs. 6, 6a. 

 1932. Cochlostyla (Cochlodryas) mateoi Bartsch, Journ. Washington Acad. Sci., 



vol. 22, p. 337. 



Shell subglobular. Nuclear whorls 2. The posterior half of the 

 nuclear turns is pale brown, while the anterior half is white. On the 

 postnuclear whorls a dark spiral band about halfway between the 

 periphery and summit of the whorls encircles the turns. This band 

 becomes on the early whorls bright chestnut-brown, while on the last 

 it deepens to dark chocolate-brown. A similarly colored band of 

 about the same width is present a little anterior to the periphery 

 on the base. In addition to this there is a narrow pale-green zone 

 separated from the summit by a narrow white thread, and another of 

 equal intensity is present on the periphery. The columellar area 

 may be brown or this element may be absent. In the specimens 

 before me about two-tlrirds have the brown markings. The base is 

 of a paler olivaceous-green. The interior of the aperture, the peri- 

 stome, and the columella are white, the dark bands showing within 

 the aperture. Nuclear whorls well rounded, smooth except for incre- 

 mental lines and fine spiral striations on the last part of the last turn. 

 The postnuclear whorls are slightly inflated, well rounded, ap- 

 pressed at the summit, and marked by strongly retractively slanting 

 lines of growth and microscopic spiral striations. Tins sculpture also 

 characterizes the base. Periphery well rounded. The base is short, 

 somewhat inflated, and strongly rounded. The aperture is broadly 

 oval; peristome expanded and reflected; the columella is slightly 

 excavated. 



The specimen described and figured (U.S.N.M. no. 313627) was 

 collected by Worcester and Bourns on the Menage Expedition in 

 northeastern Mindoro. It has 5 whorls and measures: Length, 27 

 mm; greater diameter, 25.5 mm; lesser diameter, 23.2 mm. 



One hundred additional specimens (U.S.N.M. no. 313626) from the 

 same source, taken at random, yield the following measurements: 



