THE NAUTILUS. / 



ing a white spiral fold. No parietal lamella. Length 3, diam. 

 1.9 mm. 



Imotojima, Ogasawara. Types no. 86479 A. N. S. P., from no. 

 1158 of Mr. Hirase's collection. 



This form is distinguished at once from others described from 

 Ogasawara-jima and the islands of Izu by the absence of a parietal 

 lamella. It occurs also on Hahajima, no. 1158 of Mr. Hirase's 

 collection. 



Qarycldum nipponense n. sp. 



Shell oblong, with a rather wide spire and obtuse apex, clear, 

 transparent corneous, smooth and glossy. Whorls 4, convex, the 

 suture well impressed. Aperture oblong, oblique, with a single, 

 small, acute lamella at the middle of the inner margin, and a larger 

 tubercle opposite to it within the outer lip, which is thickened 

 throughout. Length 1.3, diam. .G mm. 



Sendai, Rikuzen. Types no. 86441 A. N. S. P., from no. 1157a 

 of Mr. Hirase's collection. 



A dwarf among pygmies. It is like C. hachijoense in its polished 

 surface, but differs in the wide spire, not tapering regularly as in that 

 insular form. C. noduliferum, pessimum and borealis are all conspic- 

 uously striate. C. noduliferum and C. nipponense are the only species 

 at present known from the main island of Japan. Specimens sent 

 from Uji-Yamada, Ise, indicate that C. nipponense has a wide range 

 along the ocean coast of Nippon. 



Alycceus oshimamis n. sp. 



Shell of the depressed low-conoid shape of other Japanese species, 

 the umbilicus oblong, the last whorl deviating tangentially about 

 half-way across the preceding. Whorls 3f, the first two smooth, 

 reddish or yellowish, the following whorl rib-striate, at first finely 

 and closely, but on the first half of the last whorl the riblets become 

 quite widely spaced. Last half of the last whorl swollen, and very 

 much more finely and closely sculptured than any other part of the 

 shell ; the neck rather strongly contracted, then swollen and sculp- 

 tured again. Aperture very oblique, circular, the lip strengthened 

 by an external rib, built forward beyond the rib, the upper and lower 

 margins arched forward a little. Alt. 2, diam. 4 mm. Operculum 

 thin, yellow. 



