NO. 1709. PHILIPPINE POND SNAILS— BARTSCH. 367 



stricted. Entire surface of periphery and base marked by strong 

 lines of growth and exceedingly fine closely spaced spiral striations. 

 Aperture subcircular; posterior angle obtuse; outer lip rendered 

 } shaped by the peripheral keel, thin, columella strongly curved; 

 peritreme continuous, black edged; interior bluish white striated 

 with smoky lines. 



The type (Cat. No. 207780, U.S.N.M.) and a good series of speci- 

 mens were collected by myself in Lake Lanao, Mindanao. The type 

 has five whorls and measures: Length, 39.0 mm.; diameter, 33.8 mm. 



It gives me pleasure to name this species for Maj. Joseph M. T. 

 Partello, through whose kindness my trip to Lake Lanao was made 

 possible. 



VIVIPARA CLEMENSI, new species. 

 Plate 34, figs. 7, 8. 



Shell very broadly conic, strongly shouldered, marked by many 

 spiral cords; greenish horn-colored externally, streaked with darker 

 varices, dark brown within, excepting the edge, which is whitish. 

 Nuclear whorls small. Post-nuclear whorls very strongly, almost 

 tabulatedly, shouldered at the summit, marked by three strong spiral 

 keels, the first of which is at the periphery and the third at the angle 

 of the shoulder, which is about halfway between the periphery and 

 the summit; the second keel falls a little anterior to the middle of 

 the space between the two. In addition to these strong keels the 

 whorls are marked by two strong cords on the shoulder, while another 

 of equal strength divides the space between the three keels. Base 

 well rounded, marked by many subequal and subequally spaced wavy 

 spiral threads. Entire surface of the shell marked by many fine 

 decidedly retractive lines of growth and numerous very fine spiral 

 striations. Aperture very broadly obovate; outer lip thin, rendered 

 slightly wavy by the spiral keels showing the external sculpture 

 within, the spiral keels and cords appearing as dark brown bands; 

 columella moderately curved; peritreme edged with black. 



Two specimens out of a large lot (Cat. No. 207781, U.S.N.M.) are 

 selected and figured as cotypes. They show the range of variation in 

 the strength of sculpture; they have five whorls and measure respec- 

 tively: Length, 35.0 and 34.3 mm.; diameter, 29.0 and 26.5 mm. 



They were collected by Rev. Joseph Clemens, at Camp Keithley, 

 north end of Lake Lanao, Mindanao, and the species is named for him. 



EXPLANATION OF PLATE 34. 



All figures natural size. 



Fig.l. Vivipara lanaonis Bartsch. 



2. Vivipara buluanensis solana Bartsch. 



3 . Vivipara cebuensis Bartsch . 



4. Vivipara mindanensis mamanua Bartsch. 

 5, 6. Vivipara partelloi Bartsch. 



7, 8. Vivipara clemensi Bartsch, 



