334 I'RiJVEKDIXGS OF THE NATIONAL MUSEUM. vol. xxx. 



PYRAMIDELLA (IPHIANA) TENUISCULPTA Lischke. 

 Plate XXVI, figs. H, 5. 



Oht'Usrus tenuisculptus Lischke, Mai. Bliitt., 1872, XIX, p. 102; also Jap. Meer. 

 Conch., Ill, 1874, pp. 58-59, pi. iii, figs. 7-8. 



Shell, elongate-conic, sides of the spire rectilinear in outline, pale 

 wax-yellow. Nuclear whorls decollated. Post-nuclear whorls flat- 

 tened, increasing ver^' regiularly in size, slightly shouldered at the 

 sunnnit, separated by well-marked sutures, and marked by faint lines 

 of growth and numerous tine, closely spaced spiral striations. Periph- 

 ery of the last whorl somewhat angulated. Base very short, well 

 rounded and slightly excavated at the umbilical region, sculptured like 

 the space between sutures. Aperture subquadrate, posterior angle 

 acute, outer lip thin, without internal lirations, columella short, some- 

 what twisted, revolute, bearing a moderately strong oblique fold a 

 little anterior to its insertion. 



The specimen described belongs to the Pastel collection, and is from 

 Japan. It has eleven post-nuclear whorls (the apex and perhaps the 

 tirst two or three post-nuclear whorls being lost), and measures: long. 

 lO.-Jrmm. ; diam. 2.9 mm. It was labeled Ohelimus hdfeatux A. Adams. 



PYRAMIDELLA (STYLOPTYGMA ) SEROTINA A. Adams. 

 Plate XVII, fig. 5. 

 Hijrnoln xerolina, A. Adam.s, Proc. Zool. Soc, 1862, p. 234. 



Shell very small, elongate-conic, wax-yellow, darker toward the 

 apex. Nuclear whorls one and one-half, rather large, looseh' coiled, 

 white, obliijuely immersed in the tirst post-nuclear whorl, i. e., the 

 first post-nuclear whorl encircles the nucleus and is thereby rendered 

 quite large and stands out beyond the general outline of the shell. 

 Post-nuclear whorls polished, moderately round(>d, marked b}' faint 

 lines of growth and here and there b}'^ an impressed axial line. Spiral 

 sculpture absent. The first four whorls are marked by a rather broad, 

 conspicuous reddish-l)rown band which encircles them at about one- 

 third of the distance between the sutures anterior to the summit; on 

 the tifth and sixth whorls this band appears as a faint line. The 

 periphery of the last whorl is also encircled by a pale reddish-yelk)W 

 spiral zone, part of which can be seen projecting above the well- 

 impressed sutures on the ])roceding two volutions. Periphei'y tmd 

 base of the last whorl well rounded, the latter rather short, nrarked 

 like tli(> space between the sutuivs. Aperture subquadrate, posterior 

 angle acute (outer lip fractured), showing several internal lirations; 

 c<»Iumella stout with a strong oblicjue fold somewhat anterior to its 

 insertion; parietal wall covered by a thin callus. 



The specimen here described belongs to the Pjetel collection. It has 

 seven post-nuclear whorls, and measures: long 3 mm.; diam. 1.1 mm. 



