Fossils from the Upper MusasViino of Kazusa and Shimosa. 29 



Family Bullidae. 



Genus Bl]L,L,A, Liiine. 



15. Bulla multiarata, Yokoyama. 



PI. I. Fig. 14. 



Shell small, moderately thick, oval. Spire sunken and with 

 a small hole. Body- whorl inflated, ornamented with over thirty 

 equidistant puncticulate impressed spiral lines. . Aperture a little 

 longer than the shell-height, narrowed ahove, dilated and rounded 

 below. Umbilicus open as a small hole. Outer lip thin, the 

 greater part running vertically downward, with only a slight cur- 

 vature. Height 4 millim. Diameter 2 millim. 



This is a nice little shell easily known by its puncticulate 

 spiral lines. 



Fossil occurrence. — Shito (rare). 



16. Sulla ovula^ Sowerby. 



PI. I. Fig. 15. 



Bulla ovula. Sowerby, Eeeve's Concb. Icoil, Bulla fig. 5. 



Bulla vemicosa Gould var. ocula. Tryon, Man. Concli., XV, p. 349, pi. XXXVI, figs. 



34, 35. 

 Bulla {venucosu var '?) ocuhnii. Pilsbry, Catalogne, p. 10. 



A single but perfect specimen. 



The shell is oval in outline and smooth on surface. It mea- 

 sures 11 millim. in height and 7.5 millim. in diameter. In 

 Tryon' s Manual of Conch ology above quoted, weak spiral grooves 

 are mentioned as present on the inner side of the outer lip which, 

 however, are absent in our fossil specimen. 



Fossil occurrence. — Shisui. 



Living. — Central, Western and Southern Japan (Ryukyu). 



