644 PROCEEDINGS OF THE ACADEMY OF [Dec., 



known. The obese lower whorls and strongly attenuated spire 

 show relationship to C. Addisoni Pils. of Kiushiu, and C. brevior 

 v. Mart, of middle Nippon both comparatively thin shells. The 

 two intermediate palatal plicae are likely to prove inconstant. 



Clausilia stereoma var. nugax Pilsbry. PI. XXXIX, figs. 78, 79. 



Much smaller and more slender than the type, which it resem- 

 bles in color and sculpture. Very solid. 



Length 13J to 14 J, diam. 4 mm. 



Length 16J-, diam. 4J mm. 



Also from Yaku-shima, probably from a different locality. 

 Types No. 81,576 Coll. A. N. S. P., from No. 671 of Mr. 

 Hi rase' s collection. 



Clausilia stereoma var. cognata Pilsbry. 



Rich reddish-brown, thinner than the types, though still very 

 strong, with about 9 whorls. Palatal plicae four or five, the inter- 

 mediate ones very small. 



Length 23J, diam. 6^ mm. 



Length 22, diam. 6| mm. 



Length 2 If, diam. 6J- mm. 



Tane-ga-shima. Types No. 81,578 Coll. A. N. S. P., from 

 No. 661 of Mr. Hirase's collection. 



As in the type, the palatal plicae are often visible through the 

 shell, and from the outside appear longer and more prominent 

 than they are found to be on opening the shell. 



Group of C. entospira. 



Shell thick, small, the inferior lamella thick and squarish below 

 (not forming a spiral fold on the columella, as in other Stereo- 

 phcedusce'), very strongly spiral within; a stout, lunate lunella 

 developed, but no palatal plicae except the principal one. Clau- 

 silium very strongly arcuate, slowly and much tapering below to 

 the subacute, thickened apex, wide above, deeply emarginate on 

 the columellar side of the filament. 



The single species known of this very distinct group has obvi- 

 ously arisen from the Stereophaadusan stock; but it is more special- 

 ized than any other known member of Stereophcedusa, both in 

 palatal armature and clausilium. 



