6 TUB NAUTILUS. 



the mouth. Aperture small, acutely angular at the position of the 

 keel ; basal lip strengthened within by a strong, white, callous rib. 

 Alt. 1^, diam. 3^ mm. 



Iraotoshiraa, Ogasawara (Mr. Y. Hirase). 



Not quite so depressed as the slightly larger H. acutissima, and 

 beautifully decussated beneath. 



Mandarina mandarina var. conus n. var. Shell much elevated, 

 the spire pyramidal, with obtuse apex. Nearly black brown, 2 or 3 

 early whorls reddish ; sometimes with a pale patch at the middle 

 of the base. Alt. 21, diam. 22 mm. 



Imotoshima, Ogasawara (Mr. Hirase, no. 896). 



Claasilia japonica var. okinoshimana, n. var. Larger than japon- 

 tca, coarsely fold-striate, with fine spiral striae visible in most of the 

 interstices; whorls 11^. Dark purplish-brown, with a yellowish 

 border under the sutures on the middle whorls. Aperture, lamellas 

 and plica; as in G. japonica. Length 31-34, diam. 7-8 mm. 



Okinoshima, Tosa. Types no. 80846 coll. A. N. S. P., from no. 

 585 of Mr. Hirase's collection. 



Distinguished by its large size, dark color and strongly developed 

 sculpture. It is not, however, different from japonica in any im- 

 portant structural feature. 



Microcystina yakuensis n. sp. 



Shell imperforate, depressed, biconvex, thin, somewhat trans- 

 lucent, pale yellow, glossy and smooth. Spire low conoidal, com- 

 posed of 4^ convex, slowly increasing whorls separated by a well 

 impressed suture. Last whorl rounded peripherally, convex beneath, 

 impressed at the axis. Aperture lunate ; peristome thin and fragile ; 

 columellar margin reflexed, somewhat thickened. Alt. 1.2, diam. 

 2.3 mm. 



Yaku-shima. Types no. 83035, A. N. S. P., from no. 900 of Mr. 

 Hirase's collection. 



This species is a miniature of " Macrochlamys " tanegashimx^ of 

 Tanega-shima and Satsuma. 



Kaliella Okiana n. sp. 



Shell subperforate, conic-depressed, thin, brownish, somewhat 

 glossy, the upper surface slightly striatulate, base whorl glossy. 

 Spirally striate. Spire conic, composed of 5 convex whorls, the 

 last slightly angular in front, becoming rounded. Aperture lunate. 



