636 PROCEEDINGS OF THE ACADEMY OF [Sept., 



surface. It has a half whorl more, the last one embracing more of the 

 preceding whorl, causing the aperture to be more narrowly lunar. 

 The last whorl is much wider, viewed from above, than in the species 

 of Microcystina of similar size, 



Macrochlamys gudei inclytus n. subsp. 



Shell similar to M. gudei, but larger. 

 Alt. 9, diam. 13.5 mm. 



Tokunoshima, Osumi. Types No. 87,509, A. N. S. P., from No. 

 1,208 of Mr. Hirase's collection. 



Zonitoides apertus n. sp. 



The shell is depressed, widely, openly umbilicate, the spire but 

 slightly convex. Pale greenish corneous-brown when fresh, " dead " 

 shells light brown. Surface glossy, closety, deeply and a little irregu- 

 larly striate throughout except the first whorl which is nearly smooth. 

 There are no spiral striae. Whorls 4, slowly increasing at first, the 

 last whorl much wider, double the width of the penultimate, rounded 

 at the periphery. Aperture oblique, oval-lunate, decidedly wider than 

 high, the peristome simple as usual. 



Alt. 2.1, diam. 4.7 mm, 



Okinoerabushima, Osumi. Types No. 87,522, A. N. S. P., from No. 

 1,258 of Mr, Hirase's collection. 



Very distinct by its discoidal form, wide last whorl and strongly 

 striate surface. 

 Hirasea insignis n. sp. 



Shell imperforate, depressed, with low-conic spire and convex base, 

 impressed in the center. Brown. Very finely and regularly striate 

 radially above, smooth below. Whorls 5, convex, very slowly widen- 

 ing. Aperture crescentic, narrow, the lip strengthened by a strong 

 white rib within, abruptly stopping short of the upper insertion. A 

 long, erect callous lamina stands at the edge of the parietal callous. 



Alt. 2, diam. 3.5 mm. 



Mukojima, Ogasawara. Types No. 87,514, A. N. S. P., from. No. 

 1,194 of Mr. Hirase's collection. 



Like Brazieria in its parietal barrier, and the only known Ogasa- 

 waran species with this structure. 



ENDODONTID^. 

 Punctum atomus n. pp. 



Shell minute, moderately umbilicate, pale yellow, glossy, sculptured 

 with sharp, close strise and very fine spirals. Whorls 3, convex, sepa- 

 rated by a deeply impressed suture, the last whorl well rounded at the 



