Fossils from the Maura Peninsula and its Immediate North. 77 



This species is united by ninny authors with Natlca, clausa 

 ]>Koi>. et Sow. whose typical specimens have the callus 

 continuous with the surrounding surface and not separated by a 

 groove as in our species. Our fossil forms all exhibit the charac- 

 ter of N. janthostoma Desh. 



Widely spread as fossils, and often frequent. 



Fossil occurrence. — Miyata Zone (Kami-Miyata, Maruyama- 

 no-Saka and Mukaibatake in Shimo-Miyata, and Nagai; Yoko- 

 suka Zone (Otsu and Yokosuka); Kamakura Zone (Kewaizaka in 

 Kamakura); Kanazawa Zone (Nojima); Koshiba Zone (Koshiba); 

 Naganuma Zone (Iijima, Kikközan and Naganuma). Upper 

 Musashino of Musashi, Kazusa and Shimosa. 



Living. — Northern and Central Japan; Kamchatka. 



Genus Pollinices, Montfoet. 



78. Pollinices pallidus, (Beoderip et Sowerby). 



Pl. IV. Fig. 1. 



Pollinices ptallidus. Pilsbrt, Cat. Mar. Moll. Jap., p. 72. 



Nati a pallida. Broderip et ^owerbt, Zool. Journ., vol. IV, p. 372. Middfndorff, Mai. 

 Ross, II, p. 92. Schrenck, Moll. Amurl. u. d. Nordjap. Meeres, p. 375. Trton, Man. Conch., 

 VIII, p. 37, pl. 94, figs. 76-78, pl. 13, fig. 15, pl. 14, figs. 26-28. 



This species resembles the preceding in the general form 

 of the shell, but is distinguished from it by the narrow open 

 umbilicus and corneous operculum. Our specinens are on an 

 average smaller than those of Natlca janthostoma, the largest 

 measuring 17 millim. in height and 15 millim. in the greatest 

 diameter. Not rare. 



Fossil occurrence. — Koshiba Zone (Koshiba). 



Living. — Circumpolar; Sea of Okhotsk. 



79. Polinices (Neverita) ampla, (Philippi). 

 Pl. V. Figs. 5, 6. . 



Pollinices (Neverit 1) atrjrfa. Pilsbrt, Cat. Mar. Moll. Jap., p. 72. 



Natica ampla. Philippi, Zeitschr. f. Malak., 1848, p. 156. Tokunaga, Foss. Env. Tokyo, 

 p. 18, pl. I. pg. 32. 



Ncerita ampla. Trton, Man. Concli., VIII, p. 32, 10, figs. 51-83, 85, 86, pl. 11, figs. 91-93, 

 pl. 12, fig. 6. 



Neverita vcsicalis. Dunker,'- Index Moll. Mar. Jap., p. 61. 



Natica robi.sta. Dünker, Moll. Jap., p. 13, pl. II, fig. 24 



Nati a licolor. Schre ck, M. 11. Ainurl. u. d Nordjap. Meeres, p. 378. 



Natica lamarckiana. Lischke, Jap. Meeres-Conch., I, p. 80. Brauns, Geol. Env. Tokio, 

 p. 30. 



