Fossils from the Miura Peninsula ami its [mniediate Kovth. 57 



longitudinally striated. The m pert uro is ovate; the columella is 

 covered with a thin, narrow and shining inner lip which lias 

 above a fold-like tubercle, below, where the outer margin of the 

 lip is free, some weak wrinkles. This inner lip is somewhat 

 curved inward, while at its base it becomes suddenly straight and 

 is then obliquely truncate. The outer lip is thin, and sharp, 

 crenate on account of the external spiral threads and especially in 

 the anterior portion; somewhat distant from the outer margin, the 

 inner surface of .the outer lip is toothed, the teeth arising from the 

 short foldings of the inner wall." 



A few specimens, not quite full grown, agreeing exactly with 

 the above description, have been collected only at one locality. 

 The largest of them measures only 10,5 millim. in height and 5 

 m ill im. in diameter. The whorls number eight. 



Fossil occurrence. — Yokosuka Zone (Yokosuka); Upper 

 Musashino of Musashi, Kazusa and Shimosa. 



Living. — Central and Western Japan. 



48. Nassa (Hima) festiva, Powis. 

 Pl. III. Fig. 6. 



Nassa festiva. Powis, Proc. Zool. Soc. London, 1835, p. 95. Lischke, Jap. Meeresconch., 

 vol. II, p. 53. Dünker, Index Moll., p. 37. Tryon, Man. (Weh., IV, p. 46, pl. 14, figs. 239-242. 

 Nassa lirata. Dünker, Moll. Jap., p. 7, pl. I, fig". -2. 



A few young specimens. The shell is ovately conical: the 

 whorls number seven, of which two belong to the embryo; the 

 others are convex, longitudinally plicated and spirally striated; the 

 plicae are coarse, rounded, broad, separated by interspaces of less 

 breadth, ten on the penultimate whorl: the spiral stria' are equal, 

 liat-topped, distant, narrower than the interspaces, four on the upper 

 whorls, four or five on the penultimate and about ten on the last 

 whorl. The aperture is ovately round. Inner lip with a callus 

 whose outer edge is free, at least in the anterior portion: a small 

 tooth or fold found near the posterior angle and a few small plicse 

 in the anterior part. Outer lip thickened by an external varix 

 with a few coarse teeth within. Canal very short and recurved. 

 Height 8 millim. Diameter about 4 millim. 



