384 PROCEEDINGS OF THE ACADEMY OF [1900. 



of a whorl, when more than one is present. Two specimens of six 

 sent by Mr. Hirase show no barriers. 



Vitrea harimensis n. sp. 



Shell narrowly umbilicate, small, depressed, thin, brownish- 

 yellow, translucent, the surface smooth and polished, growth-strise 

 being scarcely visible. Spire slightly convex. Whorls 3J, the 

 first one rather large, the rest very slowly widening to the last, 

 which is much wider, about double the width of the preceding. 

 Sutures appressed and margined, the margin concave. Periphery 

 equably rounded, the base somewhat convex. Aperture somewhat 

 oblique, deeply crescentic. 



Alt. 1.8, diam. 3.5 mm. ; width of umbilicus 0.3 mm. 



Kashima, Harima, Japan (Y. Hirase). 



With much the form of V. radiatella Reinh., this species is dis- 

 tinguished by the smoothness of the brilliantly glossy surface. 

 Mr. G. K. Gude has recently placed radiatella under Zonitoides 

 nitidus as a synonym, but from the description and figure given by 

 Mr. Reinhardt I am quite unable to follow him. 



Georissa japonica n. sp. 



Shell minute, imperforate, high-conic, flesh or salmon tinted, 

 rather thin, finely lirulate throughout, but the threads often almost 

 obsolete basally. Whorls 3f , the nucleus large, globular and 

 projecting, glossy and rather translucent; following whorls very 

 convex, separated by deep sutures. Aperture slightly oblique, 

 half-round, the outer lip simple and thin, unexpanded, parietal 

 and columellar margin a little concave; the umbilical region covered 

 by a heavy white callus, triangular in shape, as seen from in 

 front. 



Alt. 2, diam. 1.7 mrn. 



Operculum semicircular, whitish externally, bearing a long 

 curved process within. 



Kashima, Harima (Mr. Y. Hirase). 



I do not know that this genus has been reported from Japan 

 hitherto. The median field of the radula is nude, uncini ex- 

 tremely numerous, in very oblique rows. 



