718 PROCEEDINGS OF THE ACADEMY OF [Oct., 



what smaller than the aperture. Aperture olDlique, rounded, about 

 one-fourth of the circle excised at the parietal margin. 



Alt. 1, diam. 2.1 mm.; width of umbilicus 0.6, of aperture 1 mm. 



Akkeshi, Kushiro. Types No. 90,230 A. N. S. Phila. from No. 1,309 

 of Mr. Hirase's collection. 



This species differs from P. amblygona Reinh. by its rounded per- 

 iphery. It is also related to the southern P. rota. 



PUPILLID^. 



Vertigo Mrasei kushiroensis n. subsp. 



Differs from V. hirasei Pils. by being larger, more solid, brown, with 

 a strong pale ridge or crest a short distance behind the outer lip. It 

 is not as wide and swollen as V. h. hachijoensis. The typical four teeth 

 are developed. 



Length 1.8, diam. 1 mm. 



Akkeshi, Kushiro. Types No. 90,223, A. N. S. Phila.. from No. 1,310 

 of Mr. Hirase's collection. 



Vertigo hirasei in some of its varieties will probably be found through- 

 out Japan, since the type came from Kyushu, while the form described 

 above is from northern Yesso, and another subspecies occurs in the 

 islands of Izu. 



ACHATINELLID^. 



Tornatellina rucuana n. sp. 



Shell imperforate, ovate-conic, thin, pale brown, lightl}^ striatulate, 

 glossy. Spire conic; whorls 4^, convex. Aperture oblique, ovate. 

 Outer lip thin and simple. Columella convex and somewhat callous 

 above; parietal lamella well developed, long. 



Alt. 3.3, diam. 1.9 mm. 



Kerama-jima, Ryukyu. Types No. 89,891, A. N. S. Phila., from No, 

 1,360 of Mr. Hirase's collection. 



This is a wider shell than T. triplicata, and the 3^oung do not have 

 internal varices or a triplicate columella. It is the first imperforate 

 Tornatellina found in the Ryukyu Islands. 



AURICULID^. 



Cassidula labrella japonica n. subsp. 



Shell imperforate, oval wdth conic spire, solid, dark brown. The 

 whorls of the spire have a groove defining a rather wide subsutural 

 border, and rarely several weak spirals below it. The last whorl is 

 very finely striate spirally, the most strongly sculptured specimens 



