THE NAUTILUS. 63 



unlike any Japanese species, though more nearly related to them 

 than to those of the central Loo Choo Islands. 



The general affinities of the faunas of the two islands are with that 

 of southern Kiusiu, but there is remarkable specialization, vastly 

 more than in Tsu-shima, for instance, although the latter is more 

 distant from the west coast of Kiusiu than these islands from the 

 south. Tsu-shima, so far as the specialization of the snail fauna is 

 concerned, might be a part of Kiusiu. Its isolation must be of very 

 recent date, but Tane-ga-shima and Yaku-shima are clearly much 

 more ancient islands. The full list of species sent by Mr. Hirase is 

 as follows : 



Species from Tane-ga-shima. 



Eulota submandarina (Pils.). Clausilia Pinto Pils. 



Ganesella tanegashimaj Pils. Clausilia tanegashima? Pils. 



Macrochlamys tanegashima? Pils. Spiropoma Nakadai Pils. 



Microcystina Hiraseana Pils. Pupinella rufa var. tanegashima?. 



Clausilia stereoma var. cognata Pils. 



Pils. Pupinella Funatoi Pils. 



Clausilia ptychocyma Pils. Diplommatina tanegashimre Pils. 

 Clausilia entospira Pils. 



Species from Yaku-shima. 

 Eulota submandarina var. magna Clausilia stereoma var. nugax Pils 



Pils. Clausilia ptychocyma var. yaku- 



Trochomorpha Gouldiana Pils. shimre Pils. 



Sitala circumcincta var. elata Ennea Iwakawa var. yakushimai 



(Gude). Pils. 



Clausilia stereoma Pils. Diplommatina yakushinite Pils. 



Yaku-shima is so for the northern limit for Trochomorpha. 



There are in all 21 forms. One species is common to Yakushima 

 and Oshima ; four are varietal or subspecitic modifications of, or 

 identical with, Kiusiu and Nippon species, and twelve species with 

 six varieties are confined, so far as we know, to the two islands. 



Most of the species have been described in the Proceedings of the 

 Academy of Natural Sciences, but the following remain to be char- 

 acterized : 



Ganesella tanegashimce n. sp. Shell imperforate, depressed, with 

 convexly-conoid spire, rather- thin. Dead specimens, denuded of 

 the cuticle are white, becoming red-brown above, the inner 3^ 



