NO. 1518. PHILIPPINE SNAILS OF GENUS VIVIPARA—BARTSCH. 147 



der. There are eleven specimens of this form. Cat. No. 192366, 

 U.S.N.M. 



Form delta (Plate XI, tig. 10). — This lacks the median keel. There 

 are four specimens of this form. Cat. No. 192367, U.S.N.M. 



Form eta (Plate XI, tig-. 9). — This lacks the median and shoulder 

 keel. There are thirty -two specimens in the lot. Cat. No. 192368, 

 U.S.N.M. 



Form til eta (Plate XI, tig. 1). — Has same number and arrangement 

 of the keels as in the t^^pical form, but they are only weakly dev^el- 

 oped; the peripheral one is not stronger than the rest and does not 

 overhang them. There are twelve specimens of this form. Cat. No. 

 192369, U.S.N.M. 



Form iota (Plate XI, tig. 5). — Like theta, but lacking the cord on 

 the shoulder. There are seven specimens in the lot. Cat. No. 192370, 

 U.S.N.M. 



Form kappa (Plate XI, tig. 3). — All tlie cords lost, except faint 

 angles marking the peripheral and suprasutural keels. Nineteen 

 specimens. Cat. No. 192371, U.S.N.M. 



Foi'm lamhda (Plate XI, tig. 6). — In this form the peripher}^ is 

 angulated and the two supraperipheral keels are merely indicated; 

 base smooth. One specimen. Cat. No. 192973, U.S.N.M. 



VIVIPARA POLYZONATA Frauenfeld. 



Plate XI, fig. 13. 



Vivipara poiyzonata Frauenfeld, K. Is.. Zool. Bot. Ges. Wien, 1862, p. 2. 



Shell conic, thin, with the apex tiesh colored, the ground color of 

 the rest olive green, while the spiral keels are dark brown. The tirst 

 three whorls are helicoid and smooth excepting a few spiral striations. 

 With the beginning of the fourth, the characteristic sculpture of the 

 adult whorls makes its appearance, though at tirst this is merely indi- 

 cated. The adult whorls are encircled between the sutures by three 

 equally strong, well-rounded dark-brown cords of which the third is at 

 the periphery and is just covered by the summit of the succeeding 

 turns, though in the last half of the last turn it is left exposed. The 

 other two keels divide the space between the peripheral keel and the 

 summit into three equal spaces. The tirst of these spaces forms a 

 moderate shoulder. An additional slender brown spiral cord, which 

 is only about one-tifth as strong as the others is located a little nearer 

 the tirst keel than the suture. Base of the last whorl rather short, well 

 arched, without uml)ilicus, marked by a number of spiral keels which 

 gradually diminish in size and become closer spaced from the periphery 

 toward the umbilicus chink. One of the specimens has seven quite 

 regularly spaced basal cords. Another has live less regularly dis- 



