1901.] NATURAL SCIENCES OF PHILADELPHIA. 385 



NEW JAPANESE MARINE, LAND AND FRESH-WATER MOLLUSCA. 



BY HENRY A. PILSBRY. 







The present paper continues the description of new species of 

 inollusks discovered by Mr. Y. Hirase. I have taken this oppor- 

 tunity to illustrate the Japanese marine shells described in a former 

 communication. 1 



PLEUROTOMID^E. 

 Daphnella fragilis var. articulata nov. PI. XXI, fig. 26. 



General form of D. fragilis (Rve. ) or D. lymnceformis (Kien. ). 

 Apical two whorls smooth; several whorls following sculptured 

 with unequal spiral cords, as coarse as those on the last whorl, 

 densely crenulate or beaded by close fine longitudinal laminae, 

 much less prominent and closer than the spirals. Last whorl 

 densely and evenly latticed by alternately larger and smaller spiral 

 cords intersecting scarcely less prominent, but rather closer, longi- 

 tudinal rib-strise. Pale brown, every fourth cord marked with 

 brown in narrow lines along the cord, alternating with diffused 

 white spots; a row of alternately brown and white squarish spots 

 below the suture; the early whorls brown. Aperture smooth 

 within, the outer lip thin, regularly arcuate, rather strongly 

 retracted above. Length 19, diam. 7, largest axis of aperture 

 11 mm. 



Hirado, Hizen, in western Kiusiu (Mr. Y. Hirase, No. 903), 

 types No. 80,634 Coll. A. K S. P.; Kamakura, just below Tokyo 

 Bay, on the eastern side of Hondo (Acad. Coll.). 



Mr. Tryon has lumped several totally distinct species under D. 

 lymnceformis, but the form so called by Kiener is less plump than 

 articulata, with even, close spirals and inconspicuous longitudinal 

 sculpture on the last whorl, while the spire has comparatively 

 strong costse and rather coarse spirals. The color, well shown in 

 Kiener' s figure, is whitish, with tawny, waved and anastomosing 

 longitudinal stripes. D. fragilis has not yet, to my knowledge, 



1 These Proceedings, p. 193. 

 25 



