386 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



sharply inward toward the parietal wall; parietal callus extremely 

 thin; suture moderately impressed. Sculpture consisting of crowded 

 axial folds or lines, indistinct on the nuclear whorl, but gradually 

 becoming plainer beyond that area." 



The holotype (Mus. Comp. Zool. no. 81354) was collected between 

 Puerto Galera and San Teodoro, Mindoro, by Pedro de Mesa. It 

 measures: Altitude, 35.5 mm; diameter, 39.5 mm; aperture height, 

 21 mm; aperture width, 20 mm. 



"This interesting new species is unfortunately represented by but 

 a single specimen. It has hitherto been overlooked and may be quite 

 rare. It bears a resemblance to several species from Luzon. It seems 

 closest to H. persimilis Fer. It is a duller yellow with lighter bands 

 and a narrower peristome, and is more depressed, having wider 

 whorls." 



As this species was described by Clench and Archer after our manu- 

 script was turned in for publication, we are unable to include a figure 

 of it in this paper. 



COCHLOSTYLA (CALOCOCHLEA) ROISSYANA (F6russac) 



Shell of medium size, helicoid, subglobular. The different subspecies 

 vary materially in the color of the periostracum as well as in the color 

 of the substance of the shell. In some both periostracum and shell 

 are white; in others the periostracum is pale straw color, in others 

 deeper yellow turning toward orange, while in still others it may be 

 wood brown and almost black. The thickness of the periostracum is 

 also decidedly variable. In some of the races it is thin, almost eva- 

 nescent, while in others it is rather thick. The shell may be without 

 bands; when this occurs, it is usually in the dark-colored forms, but 

 even there banding is present in most specimens. In some races the 

 banding is confined to a narrow zone on the summit of the whorls 

 and the umbilical area, while in others a number of spiral bands are 

 present between the summit and the umbilicus. The interior of the 

 aperture in all the specimens before me is bluish white, even in the 

 almost black individuals, and the peristome is edged with dark brown, 

 although in one race, C. (Calocochlea) roissyana cavitala, from Mount 

 Calavite, the dark peristome is less accentuated. Nuclear whorls about 

 2, slightly rounded, marked by fine incremental lines and on the last 

 portion of the last turn by the beginning of spiral striations. The 

 postnuclear whorls are strongly rounded, appressed at the summit, 

 and marked by fine incremental lines and very fine spiral striations. 

 The periphery is feebly obsoletely angulated. Base inflated, strongly 

 rounded, and having the same sculpture as the spire. The aperture 

 is subcircular, slightly oblique. The peristome is slightly expanded 

 and reflected; the columella is rather stout and oblique and slightly 

 excavated. 



