144 PROCEEDINGS OF THE NATIONAL MWEUM. vol. xxxii. 



somewhat polygonal on its posterior half by the spiral cords; colu- 

 mella slender, decidedly concave and slightly reflected; parietal wall 

 covered with a thick white callus which is black-edged like the lip and 

 renderes the peristome continuous. 



The type, Cat. No. 1929(30, U.S.N.M., was collected by Maj. Edgar 

 A. Mearns in Lake Lanao, Mindanao, Philippine Islands. It lacks 

 the nucleus and sonic of the earlier whorls, the last four only remain 

 and these measure: Altitude, 31.7 mm.; greater diameter, 27.4 mm.; 

 lesser diameter, 25.4 mm. Aperture: Altitude (from the posterior 

 angle to the base of the columella), 18.5 mm. ; diameter (at right angles 

 to the last from the middle keel), 14.9 mm. 



VIVIPARA PAGODULA, new species. 

 Plate X, lig. 8. 



Shell thin, broadly conic, turreted, greenish yellow with irregularly 

 disposed, narrow, dark bands coinciding with the lines of growth. 

 Nepionic whorls decollated. Succeeding turns rather depressed, with 

 a broad sloping shoulder above, which extends from the summit to the 

 strongly keeled periphery . This shoulder is marked by two spiral 

 lirations, which are placed a little to each side of the middle of the 

 upper surface. The periphery is marked by a very strong, hollow 

 keel, which falls about one-third of the distance anterior to the sum- 

 mit, from the summit to the base of the columella in the last turn. 

 The space between the periphery and the summit of the succeeding 

 turn is marked by two equally developed spiral keels, which are placed 

 on the vertical side. The lower one of these is immediately above the 

 suture, while the upper one is at some little distance below the periph- 

 ery, which projects considerably beyond them. Base of the last whorl 

 rather short, marked by the two strong spiral keels, which are rather 

 closely spaced and enclose a narrow channel between them. The space 

 between the posterior keel and the periphery is quite strongly con- 

 cave. The space between the basal keel and the narrow, almost cov- 

 ered, umbilicus is well arched and marked bj^ eight slender lirations, 

 which are less stronglj^ developed and more closely spaced about the 

 umbilical area than at the keel. These lirations as well as the tw^o 

 basal keels are rendered faintly crenulato by the incremental lines. 

 The spaces between the spiral keels and the lirations are marked by 

 many exceedingly tine incised spiral striations, both on the spire and 

 the base. Aperture slightly efl'use basall}", irregular in outline, the 

 peripheral keel marking a deep acute angle and the two basal ones 

 shallow rounded channels in the thin outer lip; columella slender, con- 

 cave, and somewhat reflected over the umbilical opening; parietal wall 

 covered with a thin callus. 



The type. Cat. no. 192S58, U.S.N.M., was collected in Lake Lanao. 

 Mindanao, Philippine Islands, by Maj. Edgar A. Mearns, and has fl\e and 



