Fossils from the Upper Mutashino of Kazusa and Shimosa. gQ 



A single worn specimen with the longer diameter of the ellip- 

 tical aperture about 35 millim. It agrees well with the figures 

 and descriptions given in the w^orks above mentioned. 



Tryon considers this species as identical with Crepidula dilatata 

 Lam. (Man. Conch., IX, p. 127) which hves along the west coast 

 of America from Alaska down to Patagonia. 



Fossil occurrence. — Sliito. 



Living. — Northern, Central and Western Japan. Behring 

 Sea. 



Family Nalicidae. 



Genus NATICA, Adanson. 



no. Natieu Janfhosfoèitft, Deshayes 



Xatica janthostoma. Desbayes, Kevue ZooL, p. 361. Pliilippi iu Syst. Conch. Cab. 



Mart. u. Cbemn., II, part 1, Natica unci Anianra, p. 53, pi. VIII, fig. 8. Liscbke, 



Jap. Meeresconcb,, I, p. 81, Danker, Index Moll., p. 61. Pilsbry, Cat., p. 71. 



Yokoyama, Foss. Miura Penin., p. 77, pi. V, figs. 8, 4. 

 Satica clausa. Tokunaga, Foss. Env. Tokyo, p. 17, pi, I, fig. 31. 

 Natica clausa car. janthostoma. Middentlorff, Mai. Eoss., II, p. 209, Scbrenck, Moll. 



Amurl. 11. d. nordjap. Meeres, p. 373. ïryon, Man. Concb., VIII, p. 31, pi. 19, fig. 



89. 



Very frequent. 



Fossil occurrence. — Otake (numerous), Shisui (do). Tega, 

 Shito (abundant). Shinagawa, Oji and Tabata in Musashi. Lower 

 Musashino of Mi3^ata, Yokosuka, Kamakura, Koshiba and Naga- 

 numa. 



Living. — Northern and Central Japan, Kamchatka. 



Genus POLITICKS, Montfort. 



111. Polhiiees potvisiunus, (Kecluz). 



PL IV. Fig. 12. 



Polinices powisianus. Pilsbry, Catalogue, p. 72. 



Xatica powisiuiia. Piecluz, Proc. Zool. Soc. London, 1843, p. 210. Pbilippi in Syst. 



Concb. Cab. Mart. u. Cbeiu., II, part 1. 46, pi. VII, fig. 4. 

 Xatica (Mamma) jmvisiana. Tryon, Man. Coucb., VIII, p. 42, pi. 15, fig. 42, pi. 19, 



fig. 92, pi. 20, figs. 99, 1011. 

 ■ Uher powisianum. Dunker, Ind. Moll., p. 62. 



