66 Art. 1. — M. Yokoyama: 



The body-whorl tapers quickly downward and is furnished on its 

 lateral surface with numerous, close, unequal spiral threads which 

 are scaly where crossed by incremental lines. Aperture oval, 

 thickened, uneven at margin and with some blunt tubercles at 

 some distance from it. Canal long, straight, closed. 



Several specimens. The largest measures 30 millim. in 

 height, and 16 millim. in diameter. 



Fossil occurrence. — Otake, Shisui, Shito. 



Living. — Centi'al Japan. 



Genus RAPAIVA, Schumacher. 

 79. Rapana he^oar, Linne^ var, fhomnsiana, Crosse. 



PI. III. Fi^r. 6. 



Rapana bezoar car. thotnasinud. Pilsbry, Cat. Mar. Mol], Jap., p. 44. 



Rapana hezoar. Liscbke, Jap. Meeresconcli., I, p. 51. Brauns, Geol. Env. Tokio, p. 51. 



Tokuuaga, Foss. Env. Tokyo, p. 5. 

 Rapana tJiomasiana. Crosse, Jour, de Concli., vol. IX, pp. 178, 268, pi. IX, X. 

 Rapana hezoar car. japonica. Dunker, Ind. Moll., p. 42. 

 Pynila bezoar var. japonica. Dunker, Moll. Jap , p. 4. 



This is a very frequent fossil in the neighbourhood of Tokyo. 

 But all the specimens hitherto found belong to a smoother form 

 without any strong spiral ril)s, known under the name of var. 

 tho7)iasiana. 



Fossil occurrence. — Otake, Kioroshi, Shisui, Tega, Shito. 

 Oji, Tabata and Shinagawa in Musashi. 



Living. — Northern, Central and Western Japan. 



Genus PURPURA, Bruguière. 



SO. Purpura heyseaita, Dunker. 



PI. III. Fig. 7. 



Purpura hei/seana. Dunker, Ind. Moll., p. 40, pi. XIII, figs. 10, 11. Pilsbry, Catalogue, 

 p. 44. 



Dunker founded his species on a single specimen of a young 

 shell. The adult shells have the spire a little more elevated than 

 in Dunker' s figure. 



