616 PROCEEDINGS OF THE ACADEMY OF [Sept., 



DESCRIPTIONS OF NEW LAND SNAILS OF THE JAPANESE EMPIEE. 

 BY H. A. PILSBRY and Y. HIRASE. 



In January of this year collecting was begun in Tokuno-shima, 

 Osumi, in the Riukiu chain, by Mr. NAKADA, whose laurels as a collector 

 have been won by his able campaigns in the Islands of Izu (1903) and 

 other parts of the empire. His work was continued in the islands 

 southward, Okinoerabu-shima and Yoron-jima, completing the chain 

 from Oshima to Okinawa or Riukiu. Kume-jima, Riukiu, an islet west 

 of Okinawa, was then visited. No land mollusks had been collected 

 from any of these islands; and Mr. Nakada's results, as they are stud- 

 ied, are found to add enormously to our zoogeographic data on the 

 Riukiu group. The Miyakojima subgroup of the Southwestern islands 

 was also further explored, and some remarkable species of genera or 

 subgenera new to the fauna were obtained, such as Plectopylis hirasei, 

 a species of Chinese type, and Diplommatina vespa P. and H. 



The Clausiliidce obtained by Mr. Nakada greatly enlarge our knowl- 

 edge, about doubling the number of Riukiuan species, and adding 

 several new endemic groups, especially to the Zaptychoid phylum. 



Meantime Mr. AZUMA has been collecting in southern Kyushu, 

 chiefly in Satsuma and its islands, particularly the Koshikijima group. 

 His results are good, although, as was expected, the number of new 

 species discovered was not great. Some unexpected forms were found, 

 such as Sitala rimicola Bens., a Himalayan species, and Clausilia 

 azumai, a fine snail belonging to the Riukiuan group Luchuphcedusa. 



A collector has also been sent to Kita-iwo-jima, of the Sulphur 

 group, near Ogasawara-jima, but the results were disappointing. It 

 seems to be, from the faunal indications, a very recent volcanic island. 

 It will be remembered that Mr. Hatai lost his life a few years ago in an 

 attempt to collect upon these remote islets. 



The present paper deals only with the new species and subspecies 

 received, exclusive of the Clausiliidce. 



OYOLOPHOBIDJE. 



Japonia tokunoshimana n. sp. 



Shell turbinate-conic, umbilicate, olive-brown, somewhat shining. 

 Sculpture of close fine growth-striaB, and fine spiral striae with much 

 larger threads at intervals, becoming much weaker on the penultimate 





