FOSSILS FROM THE ENVIRONS OF TOKYO. 25 



versed by narrow but distinct striations ; aperture subquadrate ; 

 outer lips curved ; canal pointed below. Heigbt and breadth 

 15""" and 6'"'" ; or 8.5""" and :^>.8""". 

 Tabata (rare). 



63. (KKITHIIM (( KKITHOPSIS) TAIUTENSIS 1\.k. 

 PI. r. V\y^. 51. 



Shell elongate-turreted, thick, many-wliorled; spire subuljite 

 and elevated ; volution flat, ornamented with three equally 

 granulated bands and indistinct irregular varices ; lower halt" of 

 body-whorl smooth ; aperture oval, narrowed below ; inner lip 

 thickened. Height 6""" and breadth 1.5°'"'. 



Tabata (rare). 



64. POTAMIDES (I.AMPAMA) ZONALE Brug. 



LiscHKE, Jap. Meeres-Concli., 1., p. 78, and II., p. 69. — Tryon, Man, 

 Moll., IX., p. 118 and p. 167.— Brauns, Geol. Env. Tokio, p. 52. 

 — PiLSBRY, Cat. Mar. Moll. .Japan, p. 57. 



<>ji (rare), Tabata (abundant). 



Living : Tokyo, Yokohama, Hakodate, Matsushiuia (Riku- 

 zen), Tsu (Ise), Nagasaki, ( )8hima (Izu), Tosa and Hong-kong. 



65. POTAMIDES (1 YMPAXOTONOS) FLUVIATILIS 



PoTiEz and Mich. 



PL I. Fig. 52. 



ÏRYON, Man. Conch., IX., ]>• 159. — I'ilsbry, Cat. Mar. Moll. Japan, 

 p. 57. — LiscHKK, Jaj). M(ere.?-Coneh., IL, p. 69. 



Synonym: — P. mieropterus Kien er. — P. alatus Phil. — P. radix Dufo. 

 — P. retifera A. Ad. — P. euryptera A. Ab. . 



Shinagawa (rare), Tabata (frequent). 



