NO. 14.-S2. NOTES ON PYRAMIDELLID.E—DALL AND BARTSCH. 827 



rounded, the next five considerably flattened, the rest decidedly obese. 

 The first five are vitreous, but as the shell grows older it gradually 

 becomes milk-white; summits of the whorls closely appressed to the 

 preceding whorl, the appressed portion appearing as a narrow band, 

 which at first sight appears as the suture; this, however, is very incon- 

 spicuous. All the postnuclear whorls are marked b}' fine lines of 

 growth and fine, closely-placed, wavy spiral striations. Periphery and 

 base of the last whoi'l well rounded, marked by lines of growth and 

 spiral striations as between the sutures. The area inmiediateW adjoin- 

 ing the columella is decidedl}^ depressed, forming a pit, but the axis 

 is not perforate. Aperture auriform, moderateh^ large, oblique; pos- 

 terior angle acute, slightly channeled at the junction of the outer lip 

 and columella; columella rather strong, very oblique, re volute show- 

 ing only the lamellar posterior fold when the lip is complete. This 

 fold is situated a little anterior to the insertion of the columella. 

 Parietal wall covered by a decided callus. Specimens having the outer 

 lip fractured show the well-developed, very oblique anterior fold, also 

 seven spiral lirations all of which but the anterior one, which is 

 stronger, are subequal and subequally spaced. 



This species enjo^'s a wide distribution. The Psetel collection contains 

 one specimen from Hawaii, which we figure and which was labeled Pyra- 

 inidella rar'iegata A. Adams, but is certainly not that species. The U. S. 

 National Museum has six shells. No. 76720, from Wallis Island, one 

 of which is here described, and three lots from the Viti Islands: No. 

 42219, seven specimens; No. 87933, five specimens, and No. 101414, 

 three specimens, all of which are remarkably uniform in appearance. 

 One specimen having the nucleus and fifteen postnuclear whorls 

 measures — long, 17.3 mm.; diam. 4.4 mm. 



PYRAMIDELLA ( ACT^OPYRAMIS) EXIMIA Lischke. 



Plate XXIII, fig. 1. 



Monoptyfjma eximiiun Lischke, Mai. Bliltt., XIX, 1872, p. lO;^; also Jap. Meer. 

 Conch., Pt. 8, 1874, p. 59, pi. in, figs. 4-6. 



Shell elongate-conic, solid, polished, early whorls white, later ones 

 light chestnut-brown, encircled by subequal spiral zones. Nuclear 

 whorls small, smooth, almost wholly immersed in the first post-nuclear 

 whorl. First four post-nuclear whorls snowy white, the second half 

 of the fifth one tinged with brown, remainder of the whorls brown. 

 All of the whorls are moderately rounded, somewhat shouldered at 

 the summit, sculptured b}^ faint lines of growth and deeply incised, 

 moderately broad spiral lines, of which there are six on the second, 

 seven on the fourth, and on the remaining whorls between the sutures; 

 on the penultimate the posterior incised line becomes obsolete and 

 the flattened raised band therefore doubly as wide. These spiral 



