34 Art. 6. — M. Yokoyama: 



opposite sense, turning their upper ends towards behind. The 

 number of tubercles of the one band is nearly equal to that of the 

 other and is about twenty-three on the last whorl; the interspaces 

 between the tubercles are nearly equal in breadth to the latter. 

 Between the upper and lower bands, the space is coarsely marked 

 with growth-lines with a, tine thread of small tubercles, often very 

 faint, just below the upper band. Periphery bluntly angular. 

 Base with coarse lines of growth and with a faint transverse groove 

 bounding the peripheral tubercles from below. Canal short, bent 

 sideward and then a little backward. 



A single specimen with the upper end broken. The whorls 

 preserved number ten, with length 23 millim. and diameter 5,5 

 millim. If the whorls were complete, the length would be about 

 30 millim. 



Fossil occurrence. — Naganuma Zone (Naganuma). 



Family Conidae. 

 Genus Conus, Linné. 



13. Conus sieboldi, Eeeve. 

 Pl. I. Fig. 14. 



Conus sieboldi. Reeve, Conch. Icon., vol. I, suppl., pl. I, spec. 269. Sowerby, Thesaur. 

 Conchyl., vol. Ill, p. 13, pl. 202, fig-. 369. Dunker, Ind. Moll. Maris Japon., p. 93. 



A single specimen, a little over 50 millim. in height and 23 

 millim. in diameter. Although the surface is much worn and the 

 apical part of the spire is broken, the slender and longly conical 

 shell with carinated shoulders and sunken whorls are too 

 characteristic to be mistaken for any other species than that above 

 mentioned. The transverse grooves at the lower part of the body- 

 whorl number about six. 



Fossil occurrence. — Koshiba Zone (Koshiba). 



Living. — Central Japan; China. 



14. Conns tuberculatus, Yokoyama. 

 Pl. I. Figs. 15, 16. 



Shell small, elongate-conic; spire elevated, acute, slightly 

 concave when seen sideways; whorls seven to eight, shouldered; 



