Fossils from the Miura Peninsula and its Immediate North. 27 



A single specimen of a small subfusiform shell, 3,5 millim. in 

 height and 1,2 millim. in diameter, with acuminate apex and fine 

 spiral lines at doth ends. In form, it stands intermediate between 

 the typical specimen of the species and its variety brevis, as figured 

 by Tkyon in his Manual of Conchology above cited. Volvula 

 acuta Tokunaga from Oji is, as I am now convinced, identical 

 with the Yokosuka-form, though somewhat less acute at apex (the 

 figure given in Tokunaga' s work represents the shell more cy- 

 lindrical than it really is). Whether Volvula oxytata Bush (Tryon's 

 Man., XV, p. 235, pi. 26, fig. 63) from the east coast of the 

 United States is really different from the European V. acuminata 

 is very doubtful; at least it comes quite close to the Japanese 

 fossil. 



Fossil occurrence in Japan: — Yokosuka Zone (Yokosuka); 

 Upper Musashino of Musashi, Kazusa and Shimosa. 



Fossil occurrence in Europe: — Pliocene of Italy; Crag of 

 England and Belgium. 



Living: — Atlantic, from Norway to Mediterranean: Suez. 



Family Scaphandridas. 



Genus Cyiichna, LovÉw 



3. Cyliclma musashiensis, Tokunaga. 



Pl. I. Fig. 4. 



Cylichna musashiensis. Tokunaga, Fobs. Envir. Tokyo, p. 32, pl. II, fig. 12. 

 Bulla cylindracea. Brauns, Geol. Env. Tokio, p. 35 (non Pennant). 



Brauns, in describing the fossils from Oji in 1881, identified 

 this species with the well known Atlantic form Cylichna cy- 

 lindracea Pennant in which, however, Tokunaga subsequently 

 recognized a new species not yet known to be living either in the 

 Japanese waters or elsewhere. On carefully comparing specimens 

 from the environs of Tokyo with the figures and descriptions 

 given of Cylichna cylindracea Pennant, I also came to the conclu- 

 sion that they are, different from the Atlantic species on the 

 following grounds: the shell is decidedly shorter (Tokunaga 

 erroneously says "more elongated)," is not compressed in the 



