IGO Mr. H. B. Preston on 7ieio 



It may also be of interest liere to slate that specimens of a 

 species luidoubtedly belonging to the Indian genus Campto- 

 ceras were forwarded to the author with the present collection ; 

 this interesting form was collected in the Kooamura-Osaka 

 district of Japan, and a specimen liad already reached the 

 writer with a request for confirmation of its generic position 

 from Jilr. Bryant Walker, of Detroit, Mich., who, he under- 

 stands, intends to describe it at an early date. 



Class GASTROPODA. 



Order PULMONATA. 



Suborder G E P H I L A. 



Family Succneidse. 



Lithotis japom'ca, sp. n. 

 (Pi. IX. figs. 6, 6 a.) 



SliLdl imperforate, small, ovate, reddish brown ; whorls 2i, 

 the fir.st small, the last very large, transversely striate and 

 slightly angled above, laterally compressed ; columella margin 

 obliquely descending, flattened, broad; labrum continuous, 

 acute; aperture large, slightly dilated. 



Alt. 1*5, diam. maj. 4, diam. min. o mm. 



Aperture: alt. 2-5, diam. 2 mm. 



Bah. L ke Biwa, Japan ; on the lower surface of stones 

 at the edge of the lake {Dr. iV. Annandale). 



Tiie shell in general form recalls, in miniature, the genus 

 Septaria. 



Suborder HygeOPHILA. 



Family Limnaeidae. 



Choavoiaphalus japonicus, sp. n. 

 (PI. IX. figs. 2, 2 a, 2-^, 2f.) 



Shell rather small, subovate, with swollen spire, thin, pale 

 yellowish brown ; whorls 3, rapidly increasing, the last 

 descending in front, tricarinate, the middle carina being 

 situated at the peripliery, the upper and lower about equi- 

 distant from it ; between thecarinse appear somewhat distant, 

 microscopic, spiral striae, while the whole shell is trans- 

 versely obliquely striate ; suture impressed ; umbilicus 

 moderately wide and deep, occupying about one-fifth of the 

 total diameter of the shell ; columella margin very obliquely 

 descending, extending above into a fine, polished, restricted. 



