i/)ß Art. G. — M. Yokoyama: 



on whorls and base crossed by lines of growth agree with the 

 Lischke's description. 



Fossil occurrence. — Yokosuka Zone (Yokosuka). 



Living. — Central Japan. 



Family Fissurellidae. 



Genus Macroschisma. Swainson. 



110. Macrcschisma sinensis, A. Adams. 



Pl. VI. Fig. 3. 



Macroschisma sinensis. A. Adams, Proc. Zool. Soc. Lond., 1855, p. 122. Sowebbt, Thes. 

 Conch., vol. Ill, p. 250, fig. 219. Pilsbrt in Trton's Man. Conch., vol. XII, p. 190, pl. 59, 

 rigs. 56-59. Catal. Mar. Moll. Japan, p. 107, pl. VI, figs. 6-8. 



This oblong shell with subparallel lateral margins, a fine 

 latticed sculpture and a long narrow perforation posteriorly some- 

 what widened and equal to about one-third the length of the 

 shell, lias been minutely described by Pilsbpy both in the Manual 

 of Conchology and his Catalogue. 



We possess three examples, the largest of which measures 19 

 miilim. in length, 8,5 millim. in breadth and 5 millim. in height. 



Fossil occurrence. — Yokosuka Zone (Yokosuka and Otsu). 

 Upper Musashino of Shimosa. 



Living. — Central Japan, China Sea, Singapore. 



Genus Pissuridea^ Swainson. 



111. Fissuridea cf. tanneri, (Vekkile). 



Pl. VI. Fig. 18. 



lismrella tanneri. Vkeeill, Proc. U. S. Nat. Mus., vol. V, p. 333, 1882; Trans. Conn. 

 Acad. S.'i., VI, p. 255, pl. 29, fig. 13. 



Glyihis tanneri. Pilsbrt in Teton's Man. Conch., XII, p. 213, pl. 63, figs. 25, 26. 



Vekkill's description of Fissurella tanneri runs as follows: 

 " Shell large, ovate, rather thin, with regularly and finely 

 decussated sculpture. Apex nearer the anterior (smaller) end, 

 moderately elevated. Perforation not large, round-oval e, con- 

 formable with the outline of the shell but more rounded, whole 

 surface covered with rather fine, raised, radiating lines, with 

 interstices of similar width or narrower; these are decussated by 



