148 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



tributed, while u third has only four cords. The entire surface of 

 the shell, in addition to the keels is marked with tine lines of growth 

 and many exceeding-fy fine spiral striations, the latter occurring between 

 the keels. Aperture suboval, bluish white within, edged with dark 

 brown; outer lip thin, rendered sinuous by the spiral keels; columella 

 moderately thick, 'glazing the umbilical area; parietal wall covered 

 with a moderately thick bluish white callus, which is edged with dark 

 brown and lends the peritreme a complete appearance. Operculum 

 light orange, thin, with depressed, eccentric nucleus, marked by many 

 lines of growth. 



The three specimens before me agree in size and sculpture, two, 

 Cat. No. 105636, U.S.N.M., come from Manila, Luzon. One of these 

 has seven whorls and measures, altitude, 19.9 mm.; greater diameter, 9 

 mm.; lesser diameter, 12.7 mm. Aperture, altitude (from the poste- 

 rior angle to the base of the columella), 11 mm.; diameter (at right 

 angles to the last, from the middle keel of the outer lip), 6.1 mm. The 

 third specimen, Cat. No. 41125, U.kS.N.M., was collected bv Benson and 

 donated by McAndrew. It bears the locality label, Philippines, and 

 probably comes from Luzon, the type locality of the species. 



VIVIPARA MAINITENSIS, new species. 

 Plate X, figs. 9, 10, 11. 



While the collection contains no less than forty-three specimens of 

 this species, there is not one of the adult shells which is perfect. It 

 has been deemed advisable therefore to base the specific diagnosis 

 upon several cotypes rather than a single imperfect individual. 



Shell subglobose, with multisulcate spire and of light brown color. 

 (The description of the first four whorls is based upon the juvenile 

 specimen.) The first two and a half whorls helicoid, well rounded, 

 rather loosel}^ coiled. The first one marked by a few transverse 

 wrinkles only. On the second one a few faint spiral lirations are 

 apparent as well as weak lines of growth. On the first half of the 

 third turn these lirations become stronger and are granulose, while on 

 the second half of the same turn three conspicuous spiral keels make 

 their appearance. These keels and the spaces between them are marked 

 by many closely-spaced, fine, finely papillose lirations. The fourth 

 whorl bears five very strong rounded keels above the periphery which 

 are equally well developed and equally spaced. Periphery marked 

 b}" a depressed sulcus, which bears a low, well-rounded keel in the 

 middle, which is about one-half as wide as the first supra and infra 

 peripheral keel. The peripheral sulcus in reality is not a sulcus but a 

 keel less raised than the two which bound it. The ])ase of the fourth 

 whorl is well rounded and marked by low, almost flattened, closely 

 spaced cords, of which there are two kinds, narrow and l)road, the 

 latter about three times as wide as the former and alternatino' with 



