50 Art. 1. — M. Tokoyama : 



Family Volutidae. 



Genus VOtUTA, Linné/ 

 50. Valuta niegaspira, Sowerby. 



Voluta niegaspira. Sowerby, Tlies. Conch , I, p. 208, pi. 48, figs. 31, 32. Dunker, Iudex 

 Moll., p. 49. Lischke, Jap. Meeresconcli., II, p 167, III, p. 43. Pilsbry. Cat., p. 24. 

 Yokoyama. Foss. Miura Penin., p. 46, pi. II, fig. 18. 



Several large specimens, though all more or less broken. 

 Fossil occurrence.— Shito. Lower Musashino of IMiyata, 

 Kamakura, Kanazawa, Koshiba and Nagannma. 



Living. — Northern, Central and Western Japan. 



Family Mitridae. 



Genus ]?HTRA, Lamarck. 



51. Mettra hondfinti, Yokoyama. 



PI. II. Fig. 8. 



Shell small, thick, fusiform. Whorls six, the first two 

 smooth and rounded, the remaining convex, with a slightly 

 excavated area at some distance from the upper suture, longitu- 

 dinally weakly plicate. Plicœ very obtuse, vertical, separated by 

 interspaces of a narrower breadth, about twenty on the penultimate 

 whorl and indistinct or obsolete on the ultimate one which is very 

 large and twice as high as the spire. Sutures margined below by a 

 weak spiral cord which is, however, often indistinct. Aperture 

 longly fusiform. Columella-plaits four, somewhat oblique, the two 

 upper ones nearly equal in size, the third more oblique and smaller, 

 the fourth the smallest and most oblique. Outer lip thin, simple, 

 smooth within. Canal short, straight. Height 10 millim. 

 Diameter 4.2 millim. 



This species resembles Mitra albina Adams (Tryoii, Man. 

 Conch., IV, p. 129, pi. 37, fig. 97) from Luzon which, howevei', is 

 larger, with the aperture more parallel-sided. Also 3ïitra lachryma 

 Reeve (Man. Conch., loc. cit., pi. 37, ffg. 93) seems to be an allied 

 form. 



