Fossils from the Upper Musashino ot Kazusa and Shimosa. 47 



Family Olividae. 



Genus OL.IVJE:IXA, Swainson. 



45. Olirellft foftunei, (A. Adams). 

 PI. II. Fig-. 3. 



Olivellafortvnei. Pilsbry, Cat., p. 23, pi. II, fig. 11. Tryon, Man. Conch., Y. p. 69, pi. 



XVI, figs. 12-15. 

 Olicafortunei. Marrat in Bowerby's Tlies. Conch., lY, p. 36, pi. XXIII (Oliva), figs. 



422, 423. 

 Olivella consobrina. Toknmiga, Foss. Env. Tokyo, p. 10, pi. I. fig. 13. Brauns, Geol. 



Env. Tokio, p. 29. (Not d. coNwhrina Lke.). 



This species has been taken Ijy Tokunaga and Brauns for 

 Olivella consobrina Lischke which is identical with 0. fuh/urata 

 Adams and Reeve, and possibly also with O. fabula Mairat. Com- 

 pared with 0- consobrina^ 0. fortunei grows larger and is broader in 

 form. A fine figure of a recent shell is given by Pilsbry in his 

 Catalogue above referred to. Of the three oblique colilmella-folds 

 present, the uppermost is usually indistinct, while the middle is 

 broad and mostl}^ obliquely striated. 



Very frequent. The largest specimen measures 19 millim. in 

 height and 8 millim. in diameter, while the smaller ones are 

 generally a little more slender. 



Fossil occurrence. — Otake, Shisui, Tega, Kamenari, Kioroshi, 

 Shito. Oji in Musashi. 



Living. — Central Japan. China. 



46. Olivella sprefoides, Yokûyama. 

 PI. II. Fig-. 4. 



Shell small, longly oval, shining. Whorls about four and a 

 half, the first one and a half embryonal and rounded, the succeed- 

 ing sloping, only a little convex, smooth. Body-whorl very 

 large, broadly rounded, somewhat tapeiing below toward the 

 caudal end, the greatest diameter being nearly in the middle of 

 the shell. Sutures channelled, the channel-end being distinctly 

 impressed on the body-whorl as a broad, shallow, transverse 



