NO. 1452. NOTES ox PYRAMIDELLID.E—DALL AND BARTSCH. 381 



PYRAMIDELLA ( ACTiEOPYRAMIS) PUNCTIGERA A. Adams. 



Plate XIX, fig. L'. 



Mmnopiygind pitnrtigera A. Adams, Ann. Mag. Nat. Hist., VII, 1861, p. 296. 



Shell slender, elong-ate-conic, milk white. Nuclear whorls two, 

 moderately large, depressed helicoid, obliqueh' one-half immersed in 

 the first of the later whorls. Post-nuclear whorls very high between 

 the sutures, moderately rounded and shouldered at the summits, 

 marked by rather coarse lines of growth and deeply impressed, ecjually 

 spaced spiral channels, which are crossed by small, quite regular and 

 regularly spaced riblets. The space between these riblets appears as a 

 pit and the whole groove as a pitted channel. Six channels are present 

 between the sutures on the second to fourth and seven on the last two 

 whorls. Periphery and base well rounded, the latter sculptured like 

 the space between the sutures, crossed by eight spiral channels. Aper- 

 ture moderately large, subquadrate, 'i posterior angle acute, (outer lip 

 fractured), columella moderately strong, twisted, columellar fold not 

 visible in the aperture, parietal wall covered by faint callus. 



The specimen above described belongs to the Psetel collection. It 

 has six post-nuclear whorls, and measures: long. 5.4mm. ; diam. 1.8 mm. 



The present species in some respects resembles P. (A.) aiiuvna 

 Adams, but is much smaller, much more attenuated, with proportion- 

 ately much higher whorls. 



PYRAMIDELLA (ACT^EOPYRAMIS ) DIGITALIS, new species. 



Plate XIX, fig. 6. 



The Psetel collection contains a young individual labeled ''^Monop- 

 tygma digitalis A, Adams," from Japan. We have been unable to 

 find any reference to such a species, and are also unable to make it 

 harmonize with any of the described forms. While we dislike to base 

 a description upon a young individual, we nevertheless feel that the 

 pi'esent report would be incomplete without it. 



Nuclear whorls small, completeW immersed, only the rounded periph- 

 ery of the last is visible above the first of the succeeding volutions. 

 Post-nuclear whorls three, inflated, well-rounded, shouldered, the second 

 encircled by live and one-half strong, narrow, subequal, and subequally 

 spaced spiral keels between the sutures, separated b}^ spaces about one 

 and one-half times as wide as the keels. These spaces are crossed at 

 regular intervals by backward-slanting axial riblets which are about 

 two-thirds as wide as the spiral keels but not quite as elevated. 

 The axial ribs and spiral keels inclose quite regular, depressed, rhom- 

 bic areas. There are six spiral keels on the third whorl. Peripherj' 

 and base well rounded, the latter somewhat produced and excavated 

 near the small umbilical chink, ornamented like the spaces between 



