84 Art ] .—M. Yokoyama : 



Characterized by the huge umbihcus which in form of a deep 

 and Inroad channel surrounds the callous process of the columella, 

 the so-called funiculum, in a semicircle. 



Fossil occurrence. — Otake (rare). 



Living. — Central and Western Japan. PhiHpjjines. Moluccas. 



112. Poliuiees (Neverifa) amttln, (Philippi). 



Polinices {Seuerita) ampla. Pilsbvy, Catalogne, p. 72. Yokoyama, Foss. Minra I'eiiiu., 



p. 78, pi. V, figs. 5, 6. 

 Natica ampla. Philippi, Zeitschr. Malak. 1845, p. 156. Toknnaga, Foss. Euv. Tokyo, 



p. 18, pi. I, fig. 32. 

 Naiicti {Neverita) anijila. Tryou, Mau. Couch., YIII, p. Si', pi. 10, figs. 8I-8H, Ho, 86, 



pi. ],figs. 91-95, pi. 12, fig. 6. 

 Keveiita vesicalis. Danker, Tnd. Moll., p. Gl. 



JSatica hicolor. Schreuck (nou Philippi), Moll. Amiirl. n. d. novdjap. Meeres, p. ö78. 

 Natica rohusta. Danker, Moll. Jap., p. 13, pi. II, fig. 24. 

 yatica lamarcJdami. Brauns, Geol. Env. Tokio, p. 30. Lischke, Jap. Meeresconch., I, 



p. 80. 

 JSatica papijracea. Tokunaga, Foss. Env. Tokyo, p. 19, pi. I. fig. 33. 



The specimens of this species are usually thick-shelled, )'Ut 

 now and then there are thin-shelled ones wliich Tokunaga separated 

 under the; name of Natica papijracea Busli. I>ut as it is quite 

 certain tiiat the latter is only an ahnormal form of the former, such 

 a separation is unnecessary. ^S'heÛiev Natica x>ctpyracca of P)ush 

 belongs to the same species or not, I am now unable to decide. 



Fossil occurrence. — Otake (numerous), Shisui, Kioroshi. 

 Kamenari. Tega. Shito (numerous). Shinagawa and Tabata in 

 Musashi. Lower Musashino of Miyata, Yokosuka and Naganuma. 



Living. — Northern and Central Japan. Clnna, Australia. 

 Indian Ocean. 



Genus SKjJAUETI'S, Lamarck. 

 11^. Siffareftts (Kiiiitifieiii(i) papilla, (Ginelin). 



PI. V. Fig-. 8. 



Sitjaretim t^KiDiaticimi) pajyilUt. Pilsbry, Catalogne, p. 73. Tryon, Man. Conch., YIII, 



p. 58, p). 25, figs. 78, 79, 87, 88. 

 Siiiaietita papilla. Lischke, Jap. Meersconch., Ill, p. 54. 

 N'lticina jiajjilla. Dunker, Ind. Moll., p. 63. 



