1900.] NATURAL SCIENCES OP PHILADELPHIA. 443 



ADDITIONS TO THE JAPANESE LAND SNAIL FAUNA. II. 

 BY HENRY A. PILSBRY. 



The discovery of the forms described herein is due to the well- 

 directed industry of Mr. Y. Hirase, of Kyoto, Japan, to whom 

 the Academy is indebted for many Japanese land snails. There 

 can be little doubt that the land molluscan fauna of Japan will 

 prove to be very prolific in specific forms, like most insular faunas. 



The Clausilias of Japan have been worked up by Dr. O. Boett- 

 ger, who in his masterly Clamilienstudien has laid a firm founda- 

 tion for future builders. Subsequent work has been done by 

 Kobelt, von Moellendorff, Smith, Sykes and the present writer. 

 Arthur Adams' contribution to the literature of Japanese Clausi- 

 lias is, like all of his Japoniana, quite worthless. 

 Clausilia hakonensis n. sp. PI. XIV, figs, l, 2, 3. 



Shell rather slenderly fusiform, moderately attenuated above, 

 the earlier 3J whorls scarcely increasing in diameter, then gradu- 

 ally increasing to the penultimate whorl which is widest, the last 

 whorl being distinctly compressed and tapering. Whorls 12. 

 Reddish or olivaceous brown, paler below the sutures, glossy where 

 not eroded, distinctly, finely striated obliquely. Aperture subver- 

 tical or slightly oblique, ovate, the peristome continuous, white, 

 well expanded. Superior lamella strong, oblique, reaching the 

 margin, continuous with the spiral lamella, but becoming abruptly 

 lower at the junction. Inferior lamella converging to the superior, 

 strongly folded, rapidly tapering below, becoming very high, stout 

 and very strongly spiral within. Subcolumellar lamella very 

 deeply immersed, not visible from the aperture. Principal plica 

 rather short; upper palatal plica short, oblique, passing into a 

 strong, curved lunella, which is connected below with the middle 

 of the rather short lower palatal plica, somewhat like a Greek 

 letter r inverted. 



Length 32, diam. of penultimate whorl 7 mm. ; length of aper- 

 ture 7.7, width 5 mm. 



