Fossils from *^he Upper Musashino of Kaznsa and Shimosa. 59 



ted longitudinal plicae number about eleven on the last whorl. The 

 largest specimen measures about 20 millim. in height and 10 mil- 

 lim. in diameter. 



Fossil occurrence. — Otake, Tega, Shito. Oji, Shinagawa, 

 Tabata and Dokwanyama in Musashi. Lower Musashino of ]\Iiyata 

 and Naganuma. 



Living. — Northern, Central and Western Japan. 



67. Nassa {Hhna) fi'atet'cultis, Diinker. 



PI. II. Fig. 21. 



}^assa {Hima) fratercidus. Pilsbry, Catalogne, p. 36. 



Xassa fratercidm. Dunker, Moll. Jap,, p. 7, pi. I, fij. 15. Iudex Moll. Mar. Jap., p. 37. 



Lischke, Jap. Meeresconcb., I, p. 60, II, p. 54, pi. IV, figs. 7, 8. 

 Tritonium {Sassa) fratercubim. Schrenck, Moll. Amnrl. n. d. nordjap. Meeres, p. 435. 



A single example. The shell is rather thick and consists of 

 about seven volutions and a half of which the first one and a half 

 are embryonal and smooth ; the remaining whorls are convex, 

 separated by deep sutures, longitudinally ribbed and spirally 

 corded. The ribs are strong, convex, narrower than interspaces, 

 eleven or twelve on the last whorl. There is also a varix at the 

 end of the penultimate whorl as well as on the outer lip which is 

 consequently thickened. The spiral cords are usually four in 

 number, broad and flat ; of these four cords, the lower three are 

 quite close together, being separated only b}^ an impressed line be- 

 tween, while the uppermost is situated midway between the upper 

 suture and the second cord and is comparatively distant from both. 

 The impressed lines above-mentioned cut the ribs on crossing them, 

 so that the latter appear tuberculous. Their number on the body- 

 whorl is about seven. Height 11 milhm. Diameter 5 millim. 



Fossil occurrence. — Otake. 



Living. — Northern, Central and Western Japan. 



Family Columbellidae. 



Genus COtU-HBEtLA, Lamarck. 



OS. C'oluinbeltti (JifilUi) burchardi, (Dunker). 



Columbella {Atilia) burchardi. Yokoyama, Foss. Miura Peniu,, p. 59, pi. Ill, fig. 17. 

 Columbella (Mitrella) burchardi. Tryon, Man. Conch., V. p. 129, pi. 49, fig. 17. 



