COCHLOSTYLA OF MINDORO PROVINCE 



521 



Shell elongate-ovate. The nuclear whorls are flesh-color. The 

 early postnuclear whorls are pale brown, gradually turning to almost 

 blackish brown on the last turn. On the early whorls a darkish zone 

 is present also at the summit of the turns. Over this ground color 

 more or less zigzag, retractively slanting, sometimes fulgurated lines of 

 greenish buff are placed. These color markings extend from the 

 summit to the umbilical chink. The aperture is bluish white within. 

 The expanded peristome and a slight portion of the outer edge of the 

 columella are smoky chocolate-brown, the dark color extending much 

 farther within the aperture than in the other races. Nuclear whorls 3, 

 well rounded. The last one is marked by a similar type of sculpture 

 as that which characterizes the postnuclear turns. The postnuclear 

 whorls are very narrowly shouldered at the summit and crossed by 

 retractively curved lines of growth, which vary very much in strength, 

 and also in spacing, but they are rather closely crowded. In ad- 

 dition the whorls are marked by the fine microscopic crisscross sculp- 

 ture characteristic of the group. Aperture broadly oval. The 

 peristome decidedly expanded and reflected. The inner lip is also 

 expanded and reflected, rather decidedly so at its insertion where its 

 reflection almost covers the umbilicus, leaving only a chink. The 

 parietal wall is covered by a rather thick callus. 



This race can at once be distinguished from the other subspecies 

 by the fact that the color is much darker than in any of the others, 

 the dark color on the peristome extending within the aperture, a 

 feature not observed in any of the other forms of this species. 



The type (U.S.N.M. no. 313552) was collected by Pedro de Mesa at 

 Calamintao, Mamborao, Mindoro, which is southwest of Mount 

 ITalcon. The type has 6.8 whorls and measures: Length, 65 mm; 

 greater diameter, 34.8 mm; lesser diameter, 27.8 mm. 



Thirteen topotypes (U.S.N.M. nos. 313553 and 313651) measure: 



