138 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



deflected toward the base and a narrow l)aii(l 1)ecoines apparent between 

 it and the peripheral keel. Base rather short, well arched, narrowly 

 umbilicated, marked by numerous tine, wavy, spiral striations as on 

 the spire. Aperture small, subcircular; black edged, bluish white 

 within; outer lip thin, faintly angled at the keels, columella thin, 

 strongly concave and somewhat reflected over the slitlike umbilicus: 

 parietal wall covered with a thick callus which renders the peristome 

 practically continuous. Operculum reddish bi-own with depressed 

 eccentric nucleus, marked by many incremental lines. 



The type and tifty-four specimens, Cat. No. 192956, U.S.N.M., 

 were collected by Maj. Edgar A. Mearns, at Zamboanga, Mindanao, 

 Philippine Islands. The type has Ave whorls (the nucleus being eroded) 

 and measures: Altitude, 25.9 mm.; greater diameter, 20.2 mm.; lesser 

 diameter, 18.8 mm; aperture, altitude (from the posterior angle to 

 the base of the columella), 13.1 mm.; diameter (at right angles to the 

 last, from the middle keel of the outer lip), 11.5 mm. 



A single much-worn individual, which is a little more slender than 

 the shells from the type locality, was collected by Major Mearns in 

 Libungan River at Labas, Rio Grande Valley, Mindanao, Philippine 

 Islands. 



VIVIPARA ZAMBOANGENSIS TUBAYENSIS, new subspecies. 

 Plate XI, fig. 16. 



Shell similar to V. zamhoangen^h^ but subglobose, with the whorl 

 more inflated and with the secondary sculpture nuich more strongly 

 developed. The six slender keels above the stronger peripheral one 

 are of almost equal strength and the spaces between them are occupied 

 by spiral lirations as in T^ zamhoangensU. The base also is more 

 inflated than in T^ zamhoangensis and the umbilicus is completely, 

 closed. In color it is also entirely different, l)eing light brown or 

 yellowish brown. The sculpture of the present form bears the same 

 relation to V. zamhoan genets that V. a. hurroughlanahQ^vs to V. angu- 

 iaris. The type, which has five whorls remaining (part of the nucleus 

 being lost), measures : Altitude, 22. 7 mm. ; greater diameter, 20. 1 mm. ; 

 lesser diameter, 18 mm. 



The type and two specimens, Cat. No. 19297-1: U.S.N.M., were col- 

 lected by Maj. Edgar A, Mearns in Tubay River at Santiago, Min- 

 danao. Philippine Islands. 



VIVIPARA ZAMBOANGENSIS DAVAOENSIS, new subspecies. 



Plate XI, fig. 17. 



This form resembles Y. s. tubayejisis in contour, but is much more 

 delicate. It is flesh colored. The periphery is marked by a weak lira- 

 tion, while the rest of the surface is marked by many ill-defined, 



