NO. 1993. 



NEW PHILIPPINE LAND SHELLS— BART8CH. 



551 



These yield the following measiiremeiits : 



This species is nearest related to Cochlostyla tenera Sowerby, 

 from Mindoro, The latter is of much more constant form and size 

 and has instead of the green suffusion a narrow green spiral band a 

 little anterior to the summit and a second one of about equal width 

 a little nearer to the subperipheral brown band than to the median. 

 The median brown band also extends to the very tip of the shell. 



Three specimens of C. tenera Sowerby yield the following data: 



COCHLOSTYLA OLANIVANENSIS, new species. 



Plate 43, figs. 4-8, 11. 



Shell broadly depressed conic; entu-e surface marked by fine, de- 

 cidedly retractive lines of growth and very fine, closely spaced spiral 

 striations. Ground color white, slightly suffused with yellowish, or 

 even white with a suffusion of light russet vinaceous; the dark tint, if 

 present, is usually on the later whorls. In addition to the ground 

 color, the whorls are marked with a deep chestnut band at the periph- 

 ery; the summit of the succeeding turns leaving this exposed as a 

 suprasutural band. The extreme appressed summit of the whorls is 

 also edged with a very narrow zone of dark chestnut which is usually 

 covered by a hydrophanous yellowish white band that extends over 

 the posterior fourth of the space between the summit and the periph- 

 ery of the whorls. The rest of this space is covered by several very 

 narrow spiral hydrophanous lines. Base marked by a rather broad 

 hydrophanous band, situated immediately anterior to the periphery; 

 a second one of about half the width of this encu-cles the base at 

 the posterior extremity of the anterior fourth, while between these 

 two there appear to be several additional slender hydrophanous 

 lines. The base of the columella is encircled by a narrow, dark chest- 

 nut zone, which is sometimes interrupted, and in some instances 



