22 THE NAUTILUS. 



half-circular; outer lip simple; columella heavily calloused, wide 

 and somewhat flattened. Length 2.1, diam. 1.85 m. 



Yaeyama Island, Loo Choo group (Mr. Y. Hirase, no. 623). 



A species relatively much shorter and wider than the related 

 G. japonic a Pils., which occurs also on Yaeyama. 



Dr. v. Mollendorff has recently redescrihed G. japonic a as a new 

 species, not knowing of my earlier description. He used the same 

 specific name (Nachrbl. 1901, p. 45). 

 Diplommatina insularum n. sp. 



Shell minute, imperforate, amber-colored or corneous, cylindric- 

 oblong, the penult whorl widest, those above forming a gradually 

 tapering spire, sculptured with delicate, rather close rib-striae. 

 Whorls 6f, convex, the last narrower than the preceding, ascending 

 to the aperture, somewhat constricted in front. Aperture circular, 

 the peristome continuous, outer lip doubled; columella acutely 

 toothed; palatal fold short. Length 2.8, diam. 1.4, alt. of aperture 

 with peristome 1 mm. 



Yaeyama, Loo Choo Islands (Mr. Y. Hirase, no. 620). 



This is a decidedly more tapering species than I). cassa. D. 

 nipponensis is less slender and smoother, and D. kobelti is larger and 

 more pyramidal. All of these are dextral forms. Paxilhis lyratus 

 Gld. may be closely allied, possibly identical ; but the description is 

 not sufficient for critical comparison. 

 Cyclotus Hirasei n. sp. 



Shell broadly and openly umbilicate, subdiscoidal, yellowish-green 

 in color, the first two whorls subtranslucent and deep amber colored; 

 rather glossy, very irregularly and roughly wrinkled or even subpli- 

 cate, in the direction of growth-lines. Whorls 3f, the first l\ 

 strongly projecting, teat-like, following whorls tubular, the last 

 whorl slowly descending, barely in contact with, or slightly free 

 from the preceding whorl, at the aperture. Aperture circular, 

 slightly oblique. Peristome circular, unexpanded and acute, con- 

 tinuous. Operculum multispiral, with sunken central nucleus, the 

 edges of the whorls projecting a little. Alt. 4.5, diam. 8.5, diam. of 

 aperture 3.3 mm. 



Loo Choo Is. (Mr. Y. Hirase, no 612). 



Related to C. swinhoei and C. minutus H. Ad., of Formosa, but 

 differing in sculpture, the present species being wrinkled but without 

 spiral striation. 



