92 Art. 1.— M. Yokoyama : 



band just at the lower sutures which appears on the body-whorl at 

 the subangulate peripheiy. Aperture subovate. Outer hp thin. 

 Columella straight, biplicate with the posterior fold larger. The 

 largest specimen measures 13 millim. in height. The diameter 

 somewhat varies according as the specimen belongs to a broader or 

 a narrower form. In the former it is a little over (36%), and in 

 the latter a little less (30^) than one-third the shell-height. 



The chestnut band is also more or less preserved in all the 

 fossil specimens. 



Fossil occurrence. — Otake (frequent), Tega, Kamcnari. Oji, 

 Tabata and Dokwanyama in Musashi. 



Living. — C'entral and Western Japan. 



12S. Ptjramifleifa (Af/afha) rirffo (AfTtftus), rar. 

 brevis Yokoyama. 



PI. V. Fig. 3. 



Dall and Bartsch give the description of Pyramidella vvrgo in 

 their ''Japanese, Indopacific and American Pyramidellidae,"" p. 

 335 as follows : 



''Shell elongate-conic, subturrited, milk-white. Nuclear 

 whorls two, small, well rounded, obliquely about one-half im- 

 mersed in the first post-nuclear whorl. Post-nuclear whorls rather 

 high between the sutures, inflated, well rounded, shouldered, 

 marked by irregular lines of growth which lend the surface a some- 

 what uneven appearance and many fine, closely placed, wavy spiral 

 striations ; sutures strongly marked. Periphery of the last whorl 

 with a faint suggestion of an angulation. Base prolonged, gently 

 rounded, marked like tlie spaces between the sutures. Aperture 

 elongate-ovate, posterior angle obtuse, somewhat effuse at the 

 junction of the hp and columella ; outer lip thin without internal 

 lirations; columella short, curved, with a very strong, acute, ob- 

 lique fold near its insertion which fuses directly and is continuous 

 with the anterior reflected portion of the columella ; parietal wall 

 ■covered by a very thin callus." 



Numerous specimens. But they are invariably more or less 



