42 THE NAUTILUS. 



of the adjacent Main Island places these islands in harmony with 

 Sado, Tsushima, Iki, and other islands in the Sea of Japan and 

 Korea Strait, all of which have faunas which show them to have 

 been joined at no remote period to the large islands of Japan. 



In the following list, the forms peculiar to Oki are marked with 

 an asterisk (*). 



CYCLOPHORID^E. 



Alycseus melanopoma Pils. (?). Nakamura. 



Diplommatina cassa Pils. var. Saigo. 



* D. okiensis Pils. & Hir. Nakamura. A subspecies of this 

 snail, D. o. tsushimana, occurs on Tsushima. 



HELICID^E. 



Eulota (Euhadra} peliomphala (Pfr.) var. Nakamura. 

 Eulota (Euhadra} senckenbergiana (Kob.) var. Nakamura. 

 Eulota (Euhadra) cattizona minor Gude. Nakamura. 

 Eulota (Plectotropis) semula Gude. Nakamura. 



* Trishoplita cretacea pergranosa Pils. & Hir. Nishinoshima. 

 Trishoplita endo Pils. & Hir. Nakanoshima. 



* Ganesella ferruginea okiensis P. & H. Nakamura. 



* Ganesella myomphala euomphala P. & H. Nakamura and 

 Chiburijima. 



Chloritis tosanus okiensis P. & H. Nakamura. 



CLAUSILIID^E. 



Clausilia (Herniphsedusa} harimensis Pils. Nakamura. 

 Clausilia japonica vespertina Pils. Nishinoshima. 

 Clausilia japonic a ultima Pils. Nakamura. 

 Clausilia nishinoshimana Pils. Nishinoshima. 



Macrochlamys subelimatus P. & H. Nakamura and Daimanji- 

 yama. 



Microcystina vaga P. & H. Nakamura. 

 Microcystina ceratodes (Gude). Nakamura. 

 Kaliella ruida Pils. var. Nakamura. 

 Kaliella fraterna Pils. Nakamura. 

 * Kaliella okiensis Pils & Hir. Nakamura. 



ENID^;. 

 Ena reiniana (Kob.) var., shaped like vgoensis. Nishinoshima. 



AuRICULIDjE. 



Carychium nipponense Pils. Saigo. 



The descriptions of new species and subspecies follow: 



