634 PROCEEDINGS OF THE ACADEMY OF [Sept., 



periphery rounded, base convex, deepl}' indented in the middle. 

 Whorls 5^, very convex, parted by a deeply impressed suture. Aper- 

 ture lunate, the columellar margin broadly dilated and reflexed. 



Alt. 2.1, diam. 2.-3 mm. 



Naha, Okinawa Island, Riukiu. Types No. 87,580, A. N. S. P., 

 from No. 1,160 of Mr. Hirase's collection. 



This species is intermediate in shape between K. pagoduloides and 

 K. modesta. 

 Kaliella gudei persubtilis n. subsp. 



Similar to /v. gudei of southern Yesso, but perceptibly lower and wider. 



Alt. 5, diam. 7 mm. 



Toshima, Izu. Types No. 85,766, A. N. S. P., from No. 1,091a of 

 Mr. Hirase's collection. Also Kozujima, Izu, No. 1,091. 



The islands of Izu have a fauna of great interest, though it is not 

 rich in species. Some forms, like Zaptyx in the Clausiliidse and the 

 varieties of Eulota submandarina , show close affinity to the Riukiu 

 fauna, and can scarcely have reached these islands in any other way 

 than by drift along the Black Current. Others, like the present species, 

 are related to Yesso forms, and probably indicate a former extension 

 southward upon the main island of species now northern in distribu- 

 tion. 



Kaliella pallida Pils. 



This species was described from Hachijo-jima, Izu, in error. It 

 comes in reality from Mizuma-mura, Izumi. The types are 83,378, 

 A. N. S. P., from No. 952 of Mr. Hirase's collection. 

 Microcystina vaga n. sp. 



Shell almost imperforate, depressed trochiform, amber-colored, sub- 

 transparent, smooth and glossy. Spire low-conic with convex outlines. 

 Whorls 6, convex, slowly increasing, the last subangular at the periph- 

 ery, convex beneath. Aperture lunate, the columella thickened with 

 a white callous within, dilated and reflexed above. 



Alt. 3.1, diam. 4.3 mm. 



Muya, Awa, Shikoku. Types No. 84,439, A. N. S. P., from No. 1,006 

 of Mr. Hirase's collection. Also from Iwaya, Awaji (No. 1,006a), 

 Midzuma, Idzumi (606c), Gojo, Yamato (606), and Hakusan, Kaga 

 (973). 



There are more whorls than in M. tanegashimce . M. obtusongida is 

 a more depressed species. 

 Microcystina lampra n. sp. 



Shell perforate, depressecl-trochiform, pale amber colored, subtrans- 

 parent, smooth and glossy. Spire low-conoid, with slightly convex 



