56 THE NAUTILUS. 



Sitala latissima n. sp. Shell minutely perforate, low trochiform, 

 dull brown. Surface nearly lustreless, showing two or three spiral 

 cuticular threads on the upper surface of the last and next earlier 

 whorls. Spire conic. "Whorls 4^, convex, separated by a deep 

 suture, the last whorl angular at the periphery, flattened, only 

 weakly convex beneath. Aperture oblique, somewhat square, the 

 periphery thin and simple, dilated at the columellar insertion. Alt. 

 1.5, diani. 2.3 mm. 



Yayeyama, Riukiu group. Types no. 83379, A. N. S. P., from 

 no. 9.53 of Mr. Hirase's collection. 



Distinct by its very broadly conic shape. {Latissimus, widest). 



Pyramidnla pauper var. hachijoensis n. var. 



Shell low-conic above, convex beneath, higher than P. pauper, 

 angular at the periphery ; regularly rib-striate, dark brown. Whorls 

 4^ ; umbilicus about one-fouith the diameter of the shell, being much 

 narrower than in pauper or depressa. Alt. 3.7, diam. G.S mm. 



Hnohijo jima, Izu. Types no. 83324, A. N. S. P., from no. 950 of 

 Mr. Hirase's collection. 



Although there is now a tendency to regard island races, where 

 intergradation with the stem-form can not occur, as of specific rank, 

 yet it seems to me that the relationshi|)s of such forms as this are 

 best indicated by the use of a trinomial. The elevation of the spire 

 and the narrower umbilicus readily distinguish this sub-species. 



BuUminus luchuamis var. oshimarius nov. Shell similar to B. 

 luchuanus, but differing in being thinner, with more conic spire, far 

 less co[)ious dark variegation, 7 to 7^ whorls, and a thinner lip. 



Length 18.3, diam. 7 mm. 



Length 16.3, diam. 6.3 mm. 



Oshima, Osumi. Types no. 83381 A. N. S. P., from no. 930 of 

 Mr. Hirase's collection. 



Bidiminus Inraseaniis n. sp. Shell rimate, egg-shaped, being 

 short, broad and compact, the spire short, conic with convex outlines, 

 apex obtuse; yellow or brown; surface minutely decussate. Whorls 

 about 6, hardly convex. Aperture oblique, ovate; peristome white, 

 expanded and somewhat reflexed, thickened within, a small nodule 

 on the parietal wall defining a narrow channel at the upper angle. 

 Length 8.5-9, diam. 5 mm. Mukojima, an islet southwest of 

 Hahajima, Ogasawara. (Mr. Y. Hirase, no. 919.) 



