NO. 1518. PHILIPPINE SNAILS OF GENUS VIVIPARA—BARTSCH. 149 



them. There are about twenty-four cords on the base; they gradu- 

 ally become narrower from the periphery to the um!)ilical chink. 

 These cords are marked by spiral lines of very minute papilhv. 



Second cotype. — Fifth and sixth whorls inflated, marked by six 

 strong, moderately rounded cords between the summits and the periph- 

 eral sulcus. The first of these, at the suture, is considerabl}^ bi-oader 

 than the rest, and somewhat flattened, forming a narrow shoulder. 

 The sutural keel is very low and ill-detined, in places bifed. Base not 

 perforated; inflated and well rounded, marked by irregularly developed 

 keels, which become quite obsolete from the middle of the base to the 

 umbilical region. Aperture rather small, suboval, bluish white 

 within; outer lip thin, faintly wavy, columella moderately thick, con- 

 cave; parietal wall covered with a thin callus. Operculum reddish 

 yellow, with slightly depressed eccentric nucleus, marked by numer- 

 ous lines of growth. 



Third cotype. — This is a badly eroded and fragmentary shell. It 

 has at least one whorl more than the second cotype, i. e., about seven. 

 This last turn has a decidedly tabulated shoulder and six rather rugose 

 spiral keels between the shoulder and the obsolete peripheral sulcus. 

 The base is likewise marked by rugose spiral keels. The keels are 

 rendered rugose by the strong almost riblike incremental lines, which 

 grow stronger as the shell increases with age. 



The three cotypes have the following number of whorls and measure: 

 First, young, has a little more than four turns, nucleus complete; 

 altitude, 9.2 mm. ; greater diameter, S.4 mm. ; lesser diameter, 7.8 mm. 



The second cotype has Ave whorls (it has lost probably one and one- 

 half), and measures: Altitude, 29.6 mm.; greater diameter, 24.5 mm.; 

 lesser diameter, 21.3 mm. Aperture, altitude (from the posterior 

 angle to the base of the columella), 16.8 mm.; diameter (at right 

 angles to the last, from the insertion of the columella), 13.3 mm. The 

 third cotype nmst have had about seven and a half whorls, six of which 

 are still visible; it measures: Altitude, 37.1 mm.; greater diameter, 

 31.5 mm.; lesser diameter, 28.4 mm. 



All of the specimens, 42, Cat. No. 192962, U.S.N.M., were collected 

 by Maj. E. A. Mearns in Lake Mainit, northeastern Mindanao, Philip- 

 pine Islands. One, Cat. No. 192961, IT.S.N.M., comes from Baganga 

 River, southeastern Mindanao, Philippine Islands. 



There are two young individuals in the collection, Cat. No. 192980 

 U.S.N.M., collected by Maj. E. A. Mearns at Lake Mainit, Mindanao, 

 Philippine Islands, which do not belong to any of the species of which 

 we have adults from that locality. They are broadly conic, with the 

 first one and one-half turns cylindrical, forming a mucronate apex. 

 The periphery is strongly keeled and the shining surface marked by 

 exceedingly fine closely spaced spiral lirations. 



