2^2 •^^'^- 1- — ^^- Yokoyama : 



Trochus imperialis. Lischke, Jap. Meerescoucli., IIT, p. 67, pi. IV, figs. 5,6. Toknnaga, 



Foss. Euv. Tokyo, p. 28 pi. I, fig. 60. 

 Trochus adamdanvs. Sclirenck, Moll. Amurl. u. cl. uordjap. Meeres, p. 358, pi. XYI, 



fig. 3. 



A few specimens. 



Fossil occurrence. — Shito. Shinagawa in Musashi. LoAver 

 Musashino of Miyala. 



Living. — Northern, Central and Western Japan. 



C-reims CJAI.I.lOSTO:»SA, Swaiusmi. 



1«>6. Calliostoiitd uiiictnii (I^iutL-er), t^af. 

 sh hutgatvensis, Toknnaga. 



PI. V. Fig. 25. 



Trochua {CalUostomct) shinagaivenm. Toknnaga, Foss. Euv. Tokyo, p. 29, pi. II, fig. 4. 



Shell turbinate-conic, pretty solid. Whorls eight, first two 

 nuclear, smooth and rounded. Post- nuclear whorls shouldered a 

 little above the middle; surface above shoulder flat, somewhat 

 sloping, below steep with a slight angulation a little above the 

 middle. Sculpture: Shoulders as well as angles with a coarse 

 spiral cord on them; flat surfaces with spiral threads which are 

 mostly alternately large and small. Of the larger threads, the sub- 

 sutural one is coarse, somewhat weaker than, or nearly as strong 

 as, the shoulder-cord, consisting of a series of more or less trans- 

 versely elongated grains. Tlie coarser threads found on the shelf 

 above may likewise become granulate, especially on the older 

 whorls. Body-whorl angulate, with a strong cord on the angle. 

 Base convex, with many unequal spiral threads which are often 

 made graniferous by incremental lines. Umbilicus closed, though 

 in some specimens it is excavated. Aperture roundly quadrate, 

 the breadth being a little greater than the height. Outer lip thin. 

 Height 21 millim. Diameter 22 miUim. In younger specimens, 

 the cords as well as the threads are much sliarper and all granulate. 

 The figure given by Toknnaga is that of such a specimen. 



Toknnaga considered this as a new species, but it is so closely 

 alHed to CalUostoma imicum Dunker (Moll. Jap., p. 23, pi. Ill, fig. 



