350 PROCEEDINGS OF THE ACADEMY OF [June, 



on a level with the suture, not produced upward, as in the otner 

 species mentioned. The upper foramen of the lip shows from in 

 front as a slit, not an orifice, as in P. rufa. 



P. fruhstorferi and tsushimana, from Iki Island and Tsushima 

 respectively, are hardly distinguishable from rufa. With a series 

 of P. rufa before me from Kobe, Awaji, Hyuga province in 

 Kiushiu, and other localities, and specimens of fruhstorferi and 

 tsushimana Mlldff. received from Fruhstofer, 1 am unable to find 

 any differential characters for Dr. von Mollendorff s supposed spe- 

 cies and subspecies except their distribution. The deeply dissected 

 western coast of Kiushiu indicates subsidence of an area long ex- 

 posed to denudation, and points to the recent isolation of Tsushima 

 and neighboring islands. Their fauna has much in common with 

 Kiushiu, and, so far as we now know, but few special species 

 strongly differentiated from those of the greater island. 



DIPLOMMATINIDJE. 



The Japanese Diplommatinidce fall into three groups : D. 

 pusilla v. Mart, and its var. omiensis Pils. are sinistral forms, 

 pusilla being placed in the genus Palaina, subgenus Cylin- 

 dropataina by Kobelt and Mollendorff; 3 but their genera Palaina 

 and Diplommatina seem to stand in need of some rearrangement, 

 judging by the lists of species. 



All of the other Japanese species apparently belong to the sec- 

 tion Sinica of the genus Diplommatina, with the single exception 

 of D. turris, which differs strongly from all other known Japanese 

 species. 



Diplommatina turris n. sp. 



Shell minute, tapering-turreted, whitish; the last two whorls of 

 about equal diameter, those above slowly tapering. Whorls 7-J 

 to 8, extremely convex, the first two smooth, the apex obtuse; the 

 last whorl but slightly ascending in front. Surface regularly sculp- 

 tured with rather widely spaced thread-like rib-strise. Aperture 

 subcircular, the columellar tooth hardly visible from in front, but 

 seen in an oblique view in the aperture to be moderately strong; 

 peristome narrowly expanded, its inner edge built forward beyond 



3 Catalog der gegenwartig lebend bekannten Pncumonopomen, p. 53. 



