NO. 1518. PHILIPPINE SNAILS OF GENUS VIVIPARA—BARTSCH. 145 



one- fourth turns (the nucleus being lost), which measure: Altitude, 30 

 mm.; greater diameter, 26.5 mm.; lesser diameter, 22.4 m.; Aperture, 

 altitude (from the posterior angle to the base of the columella), 15.9 

 mm. ; diameter (at right angles to the last measurement at the basal keel 

 of the outer lip), 13.3 mm. 



VIVIPARA GILLIANA, new species. 

 Plate X, fig. 12. 



Shell large, broadly conic, reddish brown. (First one and one-half 

 whorls worn.) The second part of the second whorl shows the 

 beginning of the sculpture of the adult turns, which consists of three 

 poorly developed keels, of which one appears at the periphery and the 

 other two between it and the summit. The space between the 

 peripheral keel and the next one is a little narrower than the space 

 between the median and posterior keel, while the space between the 

 summit and the posterior keel is considerably wider still. The space 

 between the summit and the posterior keel is moderatel}^ rounded and 

 forms the shoulder of the whorl. The spaces between the other keels 

 are flattened. The greatest convexity of the whorls is marked b}^ the 

 median keel. Periphery of the last whorl angulated. Base moder- 

 ately long, strongly arched. The entire surface of the spire and base 

 is marked by rather strongly expressed, incremental lines and many 

 closely placed, microscopic spiral lirations. Aperture large, subcir- 

 cular, reddish brown within; outer lip thin, rendered slightly angular 

 by the keels; columella slender, concave, somewhat reflected over the 

 umbilical area; parietal wall covered with a moderately thick dark 

 colored callus. Operculum thin, yellowish, with decidedly depressed 

 eccentric nucleus, marked by many lines of growth. 



The type and five additional specimens (three of which are uepionic 

 shells having the same sculpture as the adult turns), Cat. No. 192972, 

 U.S.N. M., were collected b}^ Maj. Edgar A-. Mearns, in Lake Lanao, 

 Mindanao, Philippine Islands. The type has five and one-half whorls 

 and measures: Altitude, 37.4 mm.; greater diameter, 27.7 mm,; lesser 

 diameter, 23.5 mm. Aperture, altitude (from the posterior angle to 

 the middle of the base), 21.1 mm.; diameter (at right angles to the 

 last, at the middle keel), 17.3 mm. 



VIVIPARA LANAONIS, new species. 



Plate XI, fig. 7. 



Shell of medium size, decidedly turreted, olive-green with many 

 narrow dark-brown bands which coincide with ihe rather strongly 

 developed lines of growth. The largest young shell, taken from a 

 specimen before birth, has four whorls, the first two of which are 

 helicoid, well rounded, and marked l)y a few faint spiral striations, 

 Proc. N. M. vol. xxxii— U7 10 



