490 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Shell large, ovate. The early whorls soiled flesh-color, the succeed- 

 ing turns brown marked by rather broad, oblique, soiled yellow, 

 more or less interrupted, and sometimes fulgurated axial bands. The 

 aperture is pearly within, the peristome of the outer and inner lips 

 and parietal callus being brown. The nuclear whorls are well rounded 

 and marked by transverse closely spaced wrinkles, which really 

 represent the beginning of the postnuclear sculpture. The post- 

 nuclear whorls are inflated and strongly rounded and very narrowly 

 shouldered at the summit. They are marked by closely spaced, low, 

 rather irregular, retractively slanting, threadlike riblets, which are 

 about as wide as the spaces that separate them and which extend 

 from the summit to the umbilical chink. In addition the surface of 

 the shell is marked by fine ciisscross sculpture, which passes obliquely 

 over the axial threads. The incised spiral lines on the base are 

 scarcely perceptible. The periphery is marked by an obsolete angle. 

 The aperture is very broadly ovate. The outer lip moderately 

 expanded and reflected. The inner lip is broadly reflected at its 

 insertion; the parietal wall is covered by a moderately thick callus. 



The type (U.S.N.M. no. 300823) was collected by Dr. Osborn at 

 Lake Naujan, Mindoro. It has 6.1 whorls and measures: Length, 

 70.3 mm; greater diameter, 42.2 mm. 



Two additional specimens (U.S.N.M. no. 313550), also from the 

 Lake Naujan region, were collected by the Worcester and Bourns 

 expedition; they have 6 whorls each and measure: Length, 71.5 and 

 71.3 mm; greater diameter, 40.2 and 44 mm, respectively. 



COCHLOSTYLA (CHRYSALLIS) ROLLEI VEXATOR Bartsch 



Plate 110, Figure 1 



1932. Cochlostyla (Chrysallis) rollei vexator Bartsch, Journ. Washington Acad. 

 Sci., vol. 22, p. 341. 



Shell small, ovate. The nuclear whorls are flesh-color; the early 

 postnuclear whorls also flesh-color with a narrow zone of brown at 

 the summit. The antepenultimate whorl is pale brown, shading 

 rapidly to chestnut-brown on the last turn. The interior of the 

 aperture is pearly gray with the peristome bright chestnut-brown, 

 which is also the color of the parietal callus. The early whorls have 

 slight indication of axial lighter zones, particularly at the summit, 

 where they appear as slender false teeth. The later whorls, particularly 

 the last one, are crossed by strongly marked, oblique, pale greenish- 

 yellow, axial bands, which vary considerably in width and regularity 

 of outline. Nuclear whorls 2.3, well rounded, the last portion showing 

 the beginning of the postnuclear threadlike sculpture. The post- 

 nuclear whorls are only moderately rounded, slightly shouldered at 

 the summit, and crossed by numerous rather irregular, retractively 



