28 Art. 1. — M. Yokoyania : 



A thin shell oblong-ovate in form and longitudinally sub- 

 plicate, 'with distant impressed spiral lines and a large aperture. It 

 agrees quite well witli the figures and descriptions given of Adams' 

 species by Lischke. 



We possess two specimens, about one (fig. 12) of which we 

 are still in doubt whether it belongs here or not, on account of its 

 bad state of preservation. 



Fossil occurrence. — Shisui and Kioroshi (?). 



Living. — Central and Western Japan. 



IS. P/tiline pygtniea. Yokoyania. 

 PI. I. Fio- 13. 



Shell small, thin, roundly quadrate in outline. Spire none, 

 the apex being somewhat sunken. Body-whorl large with its 

 middle portion slightly excavated. Incremental lines distinct, 

 crossing the dense, wavy punctate, impressed spiral lines. Height 

 4 millim. Breadtli 3.5 millim. 



This species is readily recognized by its small size and 

 subquadrate shape. 



Fossil occurrence. — Shisui (rare). 



Living. — Central Japan. 



14. Philine fal^atetèsis, Yokoyama. 

 PL V. Fig. 4. 



Shell rather small, thin, swollen, oval in outline, with the 

 anterior end sharper than the posterior. About fifteen distant 

 elevated spiral riblets ornament the surface. Lines of growth 

 numerous and distinct. Aperture very large, oval, with a broad 

 and shallow notch at the place where it touches the coiled portion 

 of the shell. 



A single specimen measuring 8.4 millim. in height and 7.4 

 millim. in apertural breadth. 



Fossil occurrence. — Shito. 



