1902.] NATURAL SCIENCES OF PHILADELPHIA. 117 



usually occur in the next species, though specimens ' ' often present 

 hammered -like sculpture on the surface," hence the name 

 malleatus. 



Mr. Iwakawa has traced this species from the Province Mutsu, at 

 the north end of Nippon, to the middle Riukiu Islands. Mr. 

 Hirase sends specimens from the islands also. Fig. 6 represents a 

 specimen from Kagoshima, Satsuma. Fig. 7 is from a very smooth 

 and glossy shell from Okinawa. 



This species is more globose than the Chinese V. stelmaphora, 

 the tube enlarging more rapidly, producing a lower spire and 

 larger aperture. 



Paludina Iceta v. Martens {Malak. Bldtt, VII, 45), described 

 from a specimen or specimens collected by Siebold, and not figured, 

 is a glossy form with some pimcture-lines, as in the smooth form of 

 V. malleatm. The type has 6 whorls, and measures alt. 23, diam. 

 21 mm. The last whorl is distinctly angular. I think this is 

 likely to prove to be a form of V. malleatus. \\ so, the name 

 has priority. 



Viviparus japonicus (v. Martens). PL IX, fig. 1. 



Paludina jnponica v. Mart., Malakozoologische Blatter, VII, 1860, 



p. 44. Reeve, Conch. Icon., fig. 13. Kobelt, t. c., p. 120, PI. 11, 



fig. 1. 

 Paludina oxytropis var. japonica Iwakawa, t. c, p. 88, PI. 5, fig. 17. 

 Paludina oxytropis var. sclateri Iwakawa, t. c, p. 89, PI. 5, fig. 14. 



Large, pyramidal, dark olive-green and glossy. The earlier 



whorls are encircled by two keels, later becoming mere angles, and 



then usually disappearing on the last whorl or two. There may also 



be some oblique malleation in places. The last whoi-1 is obscurely 



angular, the angle darker. There are no puncture-lines, as in 



V. malleatus, though there are fine, subobsolete spiral striae. The 



specimen figured is from Omaki, Yamashiro. The type locality is 



not known, the specimens brought home by Siebold being merely 



labeled Japan. 



Viviparus japonicus var. iwakawa nov. PI. IX, fig. 3. 



Paludina oxytropis Bens., Kobelt, t. c, p. 123, PI. 11, figs. 6, 6a, 



(exclusive of synonymy). 

 P. oxytropis Bens., Iwakawa, t. c., p. 88, PI. 5, figs. 12, 13. Not 



Paludina oxytropis Benson, an Indian species belonging to an 



appreciably difterent group ! 



Differing from V. japonicus chiefly in the persi.steuce in adult 

 shells of the keel at the periphery, giving the shell " the shape of a 



