580 PROCEEDINGS OF THE ACADEMY OF [DeC 



spirally, and is visible in oblique view in the mouth as a strong fold 

 approaching the superior lamella. Spiral lamella very low throughout. 

 Base of the shell conspicuously full and sack-like, the latter part of 

 the last whorl sharply striate. Clausihum broad throughout, rounded 

 at the apex, strongly bent near the middle. Type C. pattalus. 



This group differs from Zaptyx by the shape of the inferior lamella 

 and the saccate base of the shell, and by the shape of the clausilium, 

 which is strongly bent near the middle, while in Zaptyx it is nearly flat 

 except close to the filament. It differs from Stereozaptyx by the shape 

 of the clausihum, which is broad at the distal or lower end in Meta- 

 zaptyx, tapering in Stereozaptyx. Also by the base of the shell, which 

 is not saccate in Stereozaptyx. 



The inferior lamella sometimes continues on the base of the penul- 

 timate whorl as a slender thread parallel to the spiral lamella, occa- 

 sionally penetrating deeper than the latter, but this thread-like con- 

 tinuation may be absent or interrupted. The spiral lamella is remark- 

 ably low throughout. As in Zaptyx, the species are closely related 

 and rather difficult. The shape of the clausihum is often characteristic. 

 Both Zaptyx and Metazaptyx are widely ranging groups in the islands 

 between Kyushu and Formosa. 



The following species belong to Metazaptyx: 



Southwestern Group of the Ryukyu Islands. 



C. pattalus Pils. Tarama-jima. 



C. p. miyakoensis Pils. Miyako-jima. 



dshima Group (Osumi). 



C. dcemonorum Pils. Ekaiga-shima. 

 C. d. viva Pils. Tokuno-shima. 



Tokara Group (Osumi). 



C. tokarana Pils. Suwanose-jima to Tokara-jima. 



C. t. saccatibasis Pils. Nakano-shima, Kuchino-shima. 



Izushichito-jima (Izu). 



C. hachijoensis Pils. Hachijo-jima and Nii-jima. 

 Clausilia tokarana n. sp. PI. XXX, fig. 3. 



The shell is cyhndric below, above tapering to the small but obtuse 

 apex; hght brown; weakly striatulate, nearly smooth, the last third 



