530 



BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



crisscross sculpture referred to in the description of the species. The 

 aperture is broadly oval; the peristome is strongly expanded reflected, 

 particularly so in the anterior portion of the outer lip and also at the 

 insertion of the columella where it is reflected over the umbilicus which 

 it almost covers. The parietal callus is rather heavy. 



The type (U.S.N.M. no. 313716) was collected at Lake Naujan 

 Mindoro, by the Menage Expedition. It has 6.5 whorls and measures: 

 Length, 62.8 mm; greater diameter, 28.8 mm; lesser diameter, 22.7 

 mm. 



Ten additional specimens (U.S.N.M. no. 313717) from the type 

 locality yield the following data: 



Two specimens (U.S.N.M. no. 195431) from Mansalay Bay yield 

 the following data: Number of whorls, 6.1 and 5.9; length, 56.3 and 

 54 mm, greater diameter, 28.8 and 27.4 mm; lesser diameter, 23.3 and 

 21.5 mm, respectively. 



This subspecies is nearest related to Cochlostyla (Chrysallis) nigriceps 

 nubijer, from which it is distinguished by its lesser size. 



COCHLOSTYLA (CHRYSALLIS) NIGRICEPS OBNUBILA Bartscb 



Plate 113, Figure 2 



1932. Cochlostyla (Chrysallis) nigriceps obnubila Bartsch, Journ. Washington 

 Acad. Sci., vol. 22, p. 343. 



Shell elongate-ovate. The nuclear whorls are very dark chocolate- 

 brown. The first postnuclear whorl is intermediate in ground color 

 between this and the rest of the postnuclear whorls, which are dark 

 chestnut-brown. The postnuclear whorls are covered with a thin 

 periostracum, which is irregularly banded, blotched, spotted, and 

 clouded with hydrophanous markings of buff. The interior of the 

 aperture is pale blue; the expanded peristome is bright blue, which is 

 also the color of the outer columellar edge, the inner corresponding 

 with the interior of the aperture. Nuclear whorls 3, the early ones 

 showing incremental lines, the later ones the postnuclear sculpture. 



