Freshicatei' Shells from Japau. 1(j1 



parietal callus; labruni acute, projecting in IVoiit, rapidly 

 receding below, sharply angled at each carinal point ot 

 termination ; aperture irregularly quadrate. 



Alt. 1-25, diam. niaj. 3"25, diam. niiii. 2*75 mm. 



Aperture: alt. 1, diam. '75 mm. 



Halt. Lake Biwa, Japan ; on the lower surface of stones 

 near the edge of the lake (^l)r. N. Anuandale). 



Choanomplialus japonicus perstriatulas, subsp. n. 

 (PI. IX. figs. 1, la, 1 ^ Ic.) 



Shell differing from the typical form in its less swollen spire, 

 strong intercarinal, spiral striation, and less angular labruin, 

 the oidy marked angle being at its base. 



Alt. 1*5, diam. maj. 3*5, diam. inin. 2*75 mm. 



Aperture : air. 1*25, diam. 1 mm. 



IJah. Lake Biwa, Japan ; on tlie lower surface of stones 

 near the edge of the lake, in company with the typical form 

 (-Dr. N. Anuandale). 



Planorhis (Gyrauluii) hiwaensis^ sp. n. 

 (PI. IX. figs. 3, 3 a, 3 ^ 3 c.) 



Shell subovate, somewhat |)lanulate above, with sunken 

 first whorl, gently rounded at the periphery, pale yellowish 

 brown, thin ; whorls 3, rapidly increasing, rather distantly 

 and coarsely spirally, and closely, finely, and indistinctly 

 transversely striate, the last whorl large and rather rapidly 

 descending in front ; suture well impressed ; base of shell 

 angled in the median region; umbilicus wide open, occu- 

 pying about one-fourth of the total diameter of the shell ; 

 columella margin very obliquely descending, slightly curved, 

 diffused above into a restricted });irietal callus ; labrum 

 receding below, acute ; aperture ovate. 



Alt. 1"5, diam. maj. 4"75, diam. niin. 3*75 mm. 



A])erture : alt. 1*75, diam. 1*75 mm. 



ILtb. Lake Biwa, Japan ; on the lower surface of stones 

 near the edge of the lake (Dr. S. Annandale). 



Order PROSOBRAXCIIIA. 



Suborder Pectinibranciiiata. 



Family Valvatidae. 



Valriita hhod'ensis, sp. n. 

 (PI. IX. figs. 4, 4 a.) 



Sln-U turbiuMte, somewhat flattened above, {lale j'ellowisli ; 



