JOURNAL OF CONCHOLOGY. 57 



DESCRIPTIONS OF THREE NEW 



SPECIES OF FRESHWATER SHELLS FROM JAPAN. 



By EDGAR A. SMITH, F.Z.S. 



Zoological Department, British Museum. 



Paludina longispira. 



Testa angitstissiine rimaia, elongata, obtuse conica, fusco-olivacea, 

 strigis et lifteis obliquis saturatioribiis, hie illic nigrescejitibiis, 

 picta ; aiifractits sex planttiscicli, sub-gradati, carmis 2 — 3 

 obsoletis cincti^ lineisque incrementi striati ; aiifr. idtimiis 

 in medio obtuse angulatus ; sutura profunda, paulo obliqua. 

 Apertu?-a pyrifornii-rotundata, -| longitudifiis totius paulo 

 siiperans, intus ccerulescens. Peristoma tenue, in regione 

 umbilicali leviter incrassatum, reflex um et nigiv limbatum. 



Longit. 50 mill., diam. max. anfr. ultimi 33 mill., min. 27 mill. 

 Apertu?-a : 22 mill, longa., 18 mill. lata. 



Hab. : Lake Biwa. 



This is the most elongate of the Japanese species of Palu- 

 dina, and has a peculiarly long turretted spire which does not, 

 however, terminate in a sharp apex. This, in specimens at all 

 approaching maturity, appears to be constantly more or less 

 eroded ; but if such were not the case it would still present the 

 obtuse appearance, for the gentle convergence of the sides of 

 the spire shows that the first whorls form a blunt apex. This 

 species has only very feeble indications of minute spiral striation, 

 and the keels on the upper whorls, which are generally three 

 in number, are never strongly, but as a rule only feebly, de- 

 veloped, and in some specimens one or more of them are 

 scarcely traceable. 



Kobelt,* in his ' Fauna japonicaextramarina,' has identified 

 with P. ingallsiana a series of specimens, also from Lake Biwa, 

 which I have little doubt belong to the present species. Palu- 

 dina ingallsiana was first described by Lea f from specimens 

 collected by Dr. T. R. Ingalls in Siara, and not in Japan as 



* Abhandl. Senkenherg. Naturforsch. Gesellsch. Bd. xi. p. 408. 

 t Proc. Acad. Nat. Sci. Philad., 1856, vol. viii. p. no. 



