716 PROCEEDINGS OF THE ACADEMY OF [Oct., 



spaced above, the base delicately engraved with very minute spiral lines. 

 Apex obtuse, whorls 4^, slightly convex, a little impressed below the 

 suture. Aperture lunate, the columellar margin dilated above, thick- 

 ened within. 



Alt. 2.25, diam. 3.8 mm. 



Kumejima, Ryukyu. Types No, 90,222, A. X. S. Phila., from No. 

 1,358 of Mr, Hirase's collection. 



Much larger than M. sinapidium or M. radiata, which seem to be 

 the most closel}^ related species. 



Miorocystina hokkaidonis n. sp. 



Shell minutely perforate, depressed, with low, conically convex 

 upper surface, convex base, and rounded periphery; yellowish, some- 

 wdiat transparent, thin and glossy. Surface marked wath very slight 

 growth lines ; under a strong magnification showing a weak very fine 

 radial striation, in places, on the spire. AVhorls 4h, moderately convex ; 

 suture well impressed; aperture rather broadly lunate, oblique, the 

 columellar margin reflexed close to its insertion scarcely thickened 

 within. 



Alt. 3.5, diam. 5 mm. 



Kayabe, Ojima. Types No, 87,925, A, N. S. Phila., from No, 1,043 

 of Mr, Hirase's collection. 



The second whorl, and sometimes several others, have a sculpture 

 recalling Kaliella, but excessively minute, 



Kaliella lioconus n. sp. 



Shell minutely perforate, trochiform, the spire conic, base convex, 

 periphery acutely angular, becoming rounded at the lip; base convex; 

 thin, yellow, somewhat transparent and very glossy. Sculpture of 

 irregular rather close but not very strong wrinkles of growth. Spire 

 low-conic with straight lateral outlines and obtuse apex. "Wliorls 5^, 

 convex, separated by an impressed suture. The first half whorl is 

 smooth, the next whorl finely striate vertically, the rest with growth- 

 wrinkles as described above, the last whorl very acutely angular in 

 front, the angle disappearing gradually on the last third, leaving it 

 rounded near the outer lip in full-grown shells. Aperture lunate-trun- 

 cate. Columella vertical, the margin triangularly dilated near the 

 insertion. 



Alt. 4, diam. 5 mm. 



Yutagawa, Uzen. Types No. 90,226, A. N. S. Phila., from No. 1,313 

 of Mr. Hirase's collection. 



This species is closely related to K. okinoshimana , but that is acutelv 



