400 On new Sj)ecies of Japanese Laud-Shells. 



Allied to the preceding, but that shell is move elevated in 

 the spire, the aperture is more widened laterally, the umbilicus 

 is a little \vider, and it is devoid of spiral sculpture. 



Microcystis Ilirafiei, sp. n. 



Shell perforate, depressed-conoid, very finely striated, de- 

 cussated with microscopic spiral lines ; thin, shining, pel- 

 lucid, dark corneous, whitish below. Spire depressed, suture 

 linear, faintly margined. Whorls 4^, a little rounded above 

 and below, iiicreasing rapidly, the last twice as wide as the 

 penultimate, not descending in front. Aperture a little 

 oblique, lunate ; peristome thin, acute ; margins distant, 

 upper depressed, columellar margin a little dilated over the 

 narrow umbilicus. 



Diara. maj. 9*75, minor 8 ; alt. 4*75 millim. 



Hab. Kashima, prov. Harima. Type in my collection. 



Three specimens received. This new species is interme- 

 diate between J/. r<jecta, Pfr., and M. Doenitzei, Reinh. 

 Three other specimens (apparently immature) I also refer to 

 this form ; they measure barely 6 millim. in diameter. 



TrishopUta cretacea, sp. n. 



Shell deeply umbilicated, conoid, irregularly striated, in- 

 distinctly and minutely granulated ; chalky white under a 

 deciduous thin yellowish-white cuticle. Spire elevated, apex 

 obtuse, sutuie impressed. Whorls 6^, rounded, increasing 

 slowly, the last descending very shortly in front, obsoletely 

 angulated at the periphery, becoming rounded and a little 

 widened at the mouth. Aperture oblique, elongate-rotundate ; 

 peristome scarcely thickened, expanded all round, the margins 

 approaching, columellar margin broadly reflected over the 

 deep but rather narrow umbilicus. 



l)iam. maj. 15*5-17'5, minor 13"5-15"5; alt. 13 millim. 



Hah. Inga, prov. Hoki. Type in my collection. 



Tlie nearest ally is T. mesogonia, Pils., but that species is 

 much smaller and possesses only 5^ whorls. The twelve 

 specimens received are all decoiticated, but some have patches 

 of the cuticle adhering. 



Plectotropis conica, sp. n. 



Shell deeply and perspectively umbilicated, conical, finely 

 striated, the striae decussated by very fine wrinkled spiral 

 lines ; from pale fuscous to reddish brown, paler around the 

 umbilicus; the thin deciduous cuticle is raised transversely 



