324 PJlOCEKDINdS OF THE XATIOXAL Ml'SECM. vol. xxx. 



the earlier whorls, the eleven remaining measure: long. 12.2 mm.; 

 diam. -t.6 nun. The other three come from H. Adams. 



Another .specimen, the nucleus of which is descril)ed, is No. 181207 

 I'.S.N.M. This also comes from Japan. It has twelve post-nuclear 

 whorls and measures: long. 11.3 nun.: diam. 4.3 nun. 



PYRAMIDELLA (TIBERIA) JAPONICA, new species. 

 Plate XXIV, tig. 2. 



Shell umt)ilicate, regularly elongate-conic, polished, ))luish-white, 

 with a diaphanous spiral band on the middle of the whorls l)etween 

 the sutures. Nuclear whorls two, moderately large, smooth, having 

 their axis at a right angle to the axis of the later whorls, and about 

 one-third immersed in the first of the«e. Post-nuclear whorls flattened, 

 slightly shouldeivd at the summit, marked only by extremeh' fine 

 lines of growth. Periphery of the last whorl angular; base rather 

 short, well rounded, marked by rather coarse lines of growth. Aper- 

 ture moderately large, suboval (outer lip fractured), showing indica- 

 tions of internal lirations; columella ver}' strong, somewhat oblique, 

 biplicate, the posterior fold lamellar, situated a little below the inser- 

 tion of the columella; anterior fold weak and very oblique. 



The t3'pe and onh' specimen is iiumature; it has eight post-nuclear 

 whorls and measures: long. 6.1 mm.; diam. 2.8 mm. 



The specimen is from the Pjetel collection and comes from Japan; 

 it was labeled Si/niola rlfrea A. Adams. 



PYRAMIDELLA (TIBERIA) PUSILLA A. Adams. 

 Plate XXIV, tig. (). 

 Oheliscus ])7islUuii A. Adams, in Shy. Thes. Conch., 1854, p. 809, pi. clxxi, fig. 7. 



Shell, small, miimtely umbilicate, moderateh^ stout, elongate-conic, 

 milk-white. Nuclear whorls small, two and one-half obliquely im- 

 mersed in the first of the succeeding whorls. Post-nuclear whorls 

 slightly rounded, decidedly shouldered at the summits and somewhat 

 angulate at the periphery, polished, marked only by lines of growth 

 and extremely minute microscopical spiral striations. The slight 

 peripheral angulations show above the summit of the succeeding whorl 

 and help to render the sutures all the more conspicuous. Base of the 

 last whorl rather long, well rounded. Aperture suboval, posterior 

 angle acute, outer lip thin, columella slightly oblitpie and revolute, 

 showing only i\ single fold at the edge. In specimens which liave the 

 outer lip fractiued, the second, i, e., anterior fold comes plaiidy into 

 view as well as five internal lirations of the outer lip. 



The sjjecimcn described and HguriHl is fi-om Japan. It has eight 

 l)ost-nucl('!n\vhoils and measures: long. (),4mm.; diam, 2,»)mm. This is 



4 





