28 Art. G.— M. Yokoyama: 



middle, and the expansion of the basal portion of the aperture is 

 [ess. The apex, however, is sunken just as in Oylichna cylmdracea 

 ;in<! funnel-shaped with bottom dosed and bounded by a rounded 

 margin. 



In a single specimen which was obtained at Koshiba, the 

 lower portion of the aperture is broken; but its general shape 

 leaves no doubl of its being identical with Tokunaga's species. 

 The transverse striations which Tokunaga thought to be absent 

 are presenl in ones, though mostly obliterated by friction, and are 

 most distinctly preserved on the apical part. Jt measures II 

 millim. in length (or height) and 6 millim. in diameter. 



Fossil occurrence: — Koshiba Zone (Koshiba); Upper Musa- 

 sliino of IVIusashi, Kazusa and Shimosa. 



4. Cylichna braunsi, Yokoyama. 

 Pl. I. Fig. 5. 



Shell small, quite cylindrical, slightly tapering at both ends, 

 truncate above, rounded below. Surface with fine impressed 

 transverse lines which are coarser and more distinct near the 

 upper and lower ends, especially near the upper. Aperture 

 linear, dilated below into an ovate shape. Apex sunken into a 

 small shallow pit. Columella lip somewhat callous. 



Two specimens. One measures '•> millim. in height and 2,8 

 millim. in diameter; while tin; other measures 7 millim. by 2,5 

 millim. 



Fossil occurrence: — Naganuma Zone (Naganuma). 



5. Cylichna sibaensis, Yamakawa. 

 Pl. I. Fig. 6. 



Cyliohna siba nsis. ïamakawa, Descnp, Fossil Opisthobr. Japan, Journ. Geol. Soc. Tokyo» 

 v.. I. will. No. 212, May, L911, p. 48, pl. XI, figs. 25 29. 



This species is readily distinguishable from the foregoing 

 forms by its conically ovoicl shape and thin shell. The surface is 

 ornamented with fine transverse striae which Yamakawa mentions 

 as occurring only in the anterior and posterior parts of the shell; 



