1908.1 NATURAL SCIENCES OF PHILADELPHIA. 561 



CLAUSILIIDJE OF THE JAPANESE EMPIRE, XII. 

 BY HENRY A. PILSBRY. 



Clausilias discovered by Mr. Y. Hirase, his correspondents and 

 assistants, during the last year or two are described below. Unusual 

 interest attaches to certain Euphsedusoid species (C. echo, C. nakadce) 

 showing stages in a degeneration series leading to Reinia. Further 

 minor phyla of the Zaptychoid series have also been found . 



Section EUPH^DUSA Boettger. 



I have elsewhere given reasons for including the group Reinia in 

 Euphcedusa. C. eastlakeana, C. echo and C. nakadce are connecting- 

 links between the typical members of these groups. 

 Clausilia eastlakeana vaga n. subsp. 



The shell is like C. eastlakeana Mlldff. The .clausiUum is slightly 

 wider, and distinctly more curved. 



Length 12.0, diam. 3.0 imn. ; whorls 7 



10.3, " 3.0 " " Qy^^^'^^o^^^^^- 



10.7, " 2.8 " " 7 \ ,, .... 



. 9 0^ u 2.7 '' " g^JAkusekijm^a. 



Nakanoshima, Osumi. Types No. 95691 A. N. S. P. from No. 1513 of 

 Mr. Hirase's collection; also Akusekijima, Osumi. 



In general appearance this shell resembles C. variegata A. Ad., from 

 which it differs in having a clausilium and two palatal plicsG. It is 

 profusely streaked with buff- white on a corneous-brown ground, the 

 lighter tint usually predominating. The peristome is incomplete, the 

 aperture being shaped like that of Ena (Buliminus). The short 

 superior lamella curves toward the left termination of the lip, and is 

 separated from the thin, low spiral lamella. The inferior lamella 

 forms a high plate within the back. The subcolumeller lamella is very 

 deeply immersed. The principal plica is rather short and lateral, 

 anil there are two short palatal plicse, one above, the other near the 

 base. 



Clausilia eastlakeana Moellendorff was described from Fu-chow, on 

 the island Nan-tai, province Fu-dshien, in southern China. So far as 



