832 PROCEEDINGS OF THE ACADEMY OF [DeC, 



The few species now known of this group are scattered over a wide 

 expanse : 



C. hachijoensis Pils. Hachijo-jima, Izu group. 



C. doBmonorum Pils. Kikaiga-shima, Oshima group. 



C. doemonorum viva Pils. Tokuno-shima, Oshima group. 



C. pattalus Pils. Tarama-jima, Oshima group. 



C. pattalus miyakaensis Pils. Miyaka-jima, Oshima group. 



Clausilia pattalus n. sp. PI. LVII, figs. 93, 94, 95, 96, 97. 



Shell cylindric below, tapering from the penultimate whorl in a long, 

 somewhat attenuate spire; brown, becoming whitish at the apex. 

 Surface glossy, finely and rather weakly striate, becoming finely and 

 sharply striate on the last third of the last whorl. Whorls S^ to 9, 

 convex, the second disproportionately long, the last compressed laterally, 

 very convex beneath. Aperture irregularly ovate, the peristome 

 whitish, refiexed, somewhat thickened within. Superior lamella small 

 marginal, continuous with the low spiral lamella, which penetrates to 

 a point above the columellar lip. Inferior lamella deeply receding, 

 scarcely visible in a front view, but seen in an oblique view as a small 

 fold approaching the superior lamella; within it ascends spirally, and 

 penetrates as far as the spiral lamella. The subcolumellar lamella is im- 

 mersed. Fulcrum and parallel lamella are developed. Principal plica 

 about one-third of a w^horl long. Upper palatal plica rather long, 

 connected in the middle with the lunella, which curves inward below. 

 There are two sutural plicae, the upper one weak or indistinct. 



Length 11.2, diam. 2.5 mm.; whorls 9. 



Length 10, diam. 2.3 mm. ; whorls 8^. 



Clausilium (PL LVII, figs. 93, 94, 95) rather short, parallel-sided, 

 the distal end very strongly curved ; the apex is blunt, tapering a little 

 on both sides. It is somewhat thickened along the palatal side, and 

 is very abruptly and deeply excised near the filament. 



Taramajima, one of the Mij'ako subgroup of the Southwestern 

 group. 



Types No. 87,639, A. N, S. P., from No. 1,301a of Mr. Hirase's col- 

 lection. 



This species is stronger than C. dcBmonorum viva, from which it differs 

 in the immersed subcolumellar lamella, the less dilated, more immersed 

 inferior lamella, and the better development of the peristome and inter- 

 nal lamellae. There are also differences in the shape of the claasilium. 



C. pattalus miyakoensis n. subsp. 



Shell thinner, paler, and often smaller than C. pattalus, with the supe- 

 rior lamella smaller. All of the lamellae and plicae are weaker. 



