1900.] NATURAL SCIENCES OF PHILADELPHIA. 673 



plic?e present; upper palatal plica independent from or united 

 with the well -developed lunella; no lower palatal plica. 



Type C. Hirasei Pils. 



Distribution: Southern Kiusiu and the Loo Choo Islands. 



The general shape of the clausilium is somewhat Hemiphsedu- 

 soid, but the abruptly bent and emarginate posterior end and 

 heavily thickened apex differ strikingly from those parts in the 

 clausilium of Hemiphsedusa. 



In C. Hirasei the clausilium (PL XXV, figs. 33, 34) is biemar- 

 ginate behind. In C. hyperoptyx the columellar side only is dis- 

 tinctly emarginaLe. 



Section EUPH^DUSA Bttg. 

 ( Group of C. shanghaiensis. ) 

 Clausilia comes n. sp. PI. XXIV, figs, l, 2, 3. 



Shell small, rimate, slenderly fusiform, rather weakly striate, 

 the last whorl with delicate rib-striae ; olivaceous brownish. Apex 

 slightly obtuse. Whorls 9, strongly convex, separated by deep 

 sutures. Aperture not oblique, pyriform, with a distinct sinulus 

 above, the peristorae white, expanded and subreflexed, scarcely 

 thickened. Superior lamella rather small, though rather higher 

 than in C. digonoptyx, diconnected from or barely continuous with 

 the spiral lamella. Inferior lamella converging strongly toward 

 the superior, though somewhat less so than in C. digonoptyx, 

 strongly spiral within. Subcolumellar lamella immersed very 

 deeply. Principal plica short and small, wholly lateral. Lunella 

 shaped as in C. aculus, but so slight as to be all but imperceptible 

 except at the ends, which appear as small, short, irregular, upper 

 and lower palatal folds. Clausilium of the typical form for 

 Euphcedusa, short and wide, broadest distally, strongly curved, 

 moderately thickened at the apex, the columellar side emarginate 

 behind (PL XXV, figs. 35, 36). 



Alt. 10, diam. 2.3 mm. 



Kashima, Harima (Mr. Y. Hirase). 



Belonging to the little group of C. aculus, digonoptyx and tau, 

 this form is smaller and deficient in palatal armature. C. aculus, 

 which probably does not occur in Japan north or east of Kiusiu, 

 has a less developed superior lamella. In C. digonoptyx the 

 lamella) converge more, the lunella is better developed, and the 



