THK NAUTILI'S. 129 



usual shape ; lip well expanded and thickened ; a noticeable angle at 

 the base of the columella. Umbilical callus small but rather thick, 

 pox-marked. Operculum is sparsely granulose and retracts barely 

 within the lip. Alt. 2.5, diam. 4.5 mm., to alt. 3, diam. 5 mm. 



Sotokaifu, Sado. Types no. 84380, A. N. S. P., from no. 901. of 

 Mr. Hirase's collection. 



Related to H. hakodadiertsis Hartm., but quite distinct by its acute 

 peripheral keel. 



Alyc&us harhnensis var. sadoensis n. v. 



Similar to A. harimensis in size, form and striation, but the strongly 

 constricted neck is quite smooth, the umbilicus is noticeably wider, 

 the reflexed sutural process is more prominent, and the peris to me is 

 much thickened outside and beveled towards the edge. 



Aikawa, Sado. Types no. 83895 A. N. S. P., from no. 996 of 

 Mr. Hirase's collection. 



Macrochlamys perfrayih's var. shikokuensis Pils. & Hir., n. v. 



Shell depressed, yellow, subtransparent, with the form of M. per- 

 frugilis Pils.,of Oshima, Osumi, but with the same number of whorls 

 it is much smaller. It is also very similar to M, duJcis Pils. in shape, 

 but the umbilicus is narrower and almost closed by the triangular 

 re-flection of the columellar lip. and the very glossy surface, is smooth, 

 without the spiral lines of M. dukis. Whorls 4|, alt. 6.5, diam. 

 13 mm. 



Kotsuzan, Awa (Shikoku). Type no 84259 A. N. S. P., from no. 

 1000 of Mr. Hirase's collection. 



Microcystina higashiyamana Pils. & Hir., n. sp. 



Shell minutely perforate, conic, brown, somewhat transparent, 

 glossy, and marked with fine, indistinct growth-lines. Spire conic, 

 the apex obtuse. 5| convex whorls, very slowly widening, the last 

 distinctly angular at the periphery, convex beneath, a little impressed 

 in the middle of the base. Aperture oblique, somewhat lunate, the 

 outer lip simple, columellar lip turned bark, strengthened by a nearly 

 vertical white callus a little way within. Alt. 2.2, diam. 3 mm. 



Higashiyama-mura, Awa, Shikoku Island. Type no. 84379, 

 A. N. S. P., from no. 1002 of Mr. Hirase's collection. 



Distinguished by the conic, Kaliella-\\\ie shape and the white cal- 

 lus within the columellar margin. 



