Fossils from the Upper Mnsashino of Kazusa aud Shimosa. 73 



Fossil occurrence. — Kamenari, Sliito (not rare), ^^urugadai 

 (Tokyo) and Dokwanyama in Musashi. I^ower ■\ru>as]iino of Yo- 

 kosuka. 



Living. — Northern, Central and Western Japan. 



Family CeHlhiopsldae. 



Genus CEKITHIOPSIS, Forbes et Haiiley. 



91. Verithioffsis tioflosoeosfafus, Yokoyama. 



PI. III. Fig. 14. 



Shell small, turrete. Whorls about thirteen, tlie first three 

 embryonal, smooth and rounded, the succeeding flat, shouldered, 

 with a narrow sloping shelf above the shoulder and somewhat 

 contracted near the lower suture where there is a suprasutural 

 spiral thread. The sculpture consists of longitudinal riblets, 

 sixteen or seventeen on the penultimate whoi'l, straight, ver- 

 tical, usually made up of two nodules placed one above the other 

 and linked together by a low ridge. Of these two nodules the 

 lower may become obsolete, in which case the whorls appear to be 

 furnished with a single spiral row of nodules at the shoulder. In- 

 terspaces equal to, or slightly broader than riblets, and furnished 

 with a few faint spiral striae. Periphery angulate, with the 

 suprasutural thread elevated and sharp. Below the peripheral 

 thread there is a second angle marked by a thread and quite obtuse. 

 Base flat, smooth or with faint spiral lines. Aperture squarish. 

 Canal short, narrow, a little bent. Height 6.5 millim. Diameter 

 2 millim. 



Of the three specimens obtained, one has a single spiral row 

 of nodules on lower whorls. 



Fossil occurrence. — Shito. 



<T3. d'evifhioitsis (Sella) fvisulenttts, Yokoyama. 

 PL III. Fio-. 15. 



Shell small, sulmlate- Whorls about seventeen, the flrst two 

 smooth and rounded, the succeeding flat in the upper third and 



