78 Art. 1. — M. Yokoyaaia 



Sliell flatly conical. Whorls five, sliglitly convex to nearly 

 flat, spirally banded both above and below tlie suture. The infra- 

 sutural band or cord is single, followed by a sulcus, while the 

 suprasutural one is double, having a groove in the middle. A nar- 

 rower groove is also found just above the band. Incremental lines 

 very conspicuous, regular, looking like striae and causing the band 

 to appear crenulate. Periphery angular, formed by the lower half 

 of the double band. Base somewliat convex witli the peripheral 

 portion flattened and with two spiral grooves of which the one 

 next to the periphery is the broadest. The base is ornamented 

 with incremental striae radiating from tlie umbilicus which is 

 comparatively small with margin coarsely crenate and encircled 

 by a deep spiral impressed line. Aperture trapezoidal. Height 

 7 millim. Diameter 14 millim. Umbilical diameter 3.5 millim. 

 The largest specimen is 21 millim. in diameter. 



Very probably this is only one form of Solarium pseudoperspec- 

 tkmm of the Mediterranean which has separated into several 

 varieties. Comparing the Japanese fossil with the figures and 

 descriptions of the above species given by Sacco, it seems to come 

 nearest to a variety called siiprastriatula (flg. 65 of Sacco). 



Fossil occurrence. — Shito. Pliocene of Italy. 



Living. — Central Japan (hitherto not mentioned in concholo- 

 gical works relating to Japan, but a specimen is at hand brought 

 from Awa (Boshu). Mediterranean. 



Genus TORINIA, Gray. 



101. Torinia eleffanfulft, Yokoyama. 

 PI. IV. Fig. 2. 



Shell small, almost discoidal, with spire very low. Whorls 

 four, flat, ornamented with six unequal spiral threads of which tlie 

 uppermost (subsutural) and the two lowest are stronger tkan the 

 others, and of the two lowest the upper is somewhat stronger 

 than the lower. Crossing these threads are incremental striae which 

 are close and elevated with a bead at the point of intersection. 

 Periphery formed by a cord and angulate. Base angulate in the 



