1901.] NATURAL SCIENCES OP PHILADELPHIA. 483 



of C. japonica, having the usual fine, sharp striation of that 

 species. 



Section MEGA.LOPHJEDUSA Boettger. 

 Clausilia Hiraseana Pilsbry. PL XXVI, figs. 24, 25, 26. 



Shell rimate, strong, the last two whorls of about equal diameter, 

 and forming half the shell's length, those above rapidly diminish- 

 ing, the lateral outlines becoming somewhat concave toward the 

 apex, the earlier three whorls being of about equal diameter; dark 

 reddish brown, with a pale band below the suture, the earliest 

 whorls white. Surface usually with a brilliant gloss, sculptured 

 ivith coarse, strong, slightly waved or uneven ribs, which occa- 

 sionally anastomose or branch, and become finer on the upper, 

 imperceptible on the earliest whorls. Whorls 11^ to 12, but 

 several are self -amputated in old individuals; they are convex and 

 parted by well-impressed sutures. The last whorl, viewed dorsally, 

 is narrower than the swollen preceding whorl, and is rather com- 

 pressed, hardly convex. Aperture rhombic-ovate, vertical; peris - 

 tome continuous, reflexed, flesh-tinted, whitish at the edge. Supe- 

 rior lamella small, marginal, oblique, continuous with the spiral 

 lamella. Inferior lamella low and receding, within rather 

 straightly ascending and strongly thickened below. Subcolumellar 

 lamella deeply immersed, not visible in a front view, but its end 

 may be seen by looking obliquely into the aperture. Principal 

 plica short, its lower end visible deep within the aperture, upper 

 end scarcely extending inward beyond the palatal armature. 

 Palatal plicae or folds lying a little dorsal of a lateral position, 

 four in number, equidistant, all strongly developed though short; 

 the upper fold a little longer, diverging from the principal plica, 

 the lower (fourth) fold slightly longer than the two median, and a 

 little arched upward in the middle. No lunella. 



Clausilium evenly and rather strongly arcuate, long and rather 

 narrow, parallel-sided. The apex is slightly acuminate on the 

 columellar side, being rounded and strongly thickened; on the 

 palatal side straightened, a little concave (PI. XXVI, figs. 

 22, 23). 



Length 27 to 29J, diam. 6 mm. 



Okinoshima, province Tosa (Y. Hirase). 



A fine, handsome species, easily known by its strong sculpture, 



