18 ART. 2.— S. TOKUNAGA. 



Upper-glacial : — Santa Barbada (California) ; San Pedro 

 (California) ; northern part of Russia (Murman Sea, White Sea 

 and Nova Zembia). 



This living Species is decidedly circumboreal. It is known 

 to be found in the following localities : — Hakodate, Bekkai, 

 Kuriro, Akkeshi, Nemuro, Otaru, (all in North Japan), Sachalin, 

 Kamtschatka, Kaojak, Ochotsk Sea, Schlanter Is., Nova-Zembla, 

 Sitka (Alaska), Melville Is. (Arctic America), Vancouver, Green- 

 land, Massachusetts and Maine, Lappland (Russia), Portugal 

 and Arctic Europe. 



Living specimens rarely found near Tokyo, Awa (or Böshu) 

 and Chöshi (Shimôsa) seem to be the remnants of those numer- 

 ous in the colder epoch. 



42. NATICA AMPLA Rve. 



PI. I. Figs. 32 a, h and c. 



Brauns, Geol. Env. Tokio, p. 30. — Schrenck, Moll. AmurL and Nord- 

 Jap. Meeres, p. 378. — Lischke Jap. Meeres-Conch., I., p. 80. — 

 Morse, Shell-Mound of Omori, p. 66. — Dunker, Index. Moll. 

 Maris Jap., p. 61. — Tryox, Man. Conch., YIII,, p. 33. — Pilsbry 

 Cat. Mar. ]Moll. Japan, p. 71. — Morse, Shell-Mound of Ömori, p. 16. 



Synonym : — N. Jamarckicma Recl. — N. didyma Bolton. — N. vesiealis 

 Phil. — N. robusta Dkr. — N. chemnitzi Recl. — N. petiveiiana'RECL. 

 — N, intermedia Recl. — iV. proUematica Rye. — N. hieolor Schrenck. 

 — N. iiieisa Dkr. 



Oji, Shinagawa and Tabata (freq.uent). 



The living form is very common in Japan : — Tokyo to 

 Enoshima (Sagami), Awa or Böshu, Choshi (Shimösa), Misaki 

 (Sagami), Henda, Shibo, Kagoshima, Kure (Satsuma), Nagasaki, 

 Hikata (Kii), Matsushima (Rikuzen), Uwajimn, Futnmigaura 

 (Ise), Tsu (Ise), Awa in Shikoku, Kôchi (Tosa) and Kagoshima. 



