1894. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 679 



PLEUROTOMELLA HAWAIIANA, new species. 



Shell small, siibfusiform, solid, polished, grayish white, with five or 

 more whorls; suture distinct, the whorl in front of it somewhat 

 excavated and appressed; spiral sculpture present only on the base, 

 wliere it is faint, and on the pillar, where it is coarser, and composed 

 of obscure close-set spiral threads ; transverse sculpture near the apex 

 of a few wrinkles, which are visible on the upper part of the anal fasci- 

 ole, beginning at the suture, but these do not persist; the lines of 

 growth are not generally perceptible without a glass; on the shoulder 

 of the whorl are (on the last whorl about 17) numerous short oblique 

 riblets with equal or wider interspaces, little raised, almost like nodules 

 on the last whorl, but near the apex of the spire they are straighter, 

 and extend from the anterior border of the fasciole to the suture, grad- 

 ually becoming feebler as the shell grows ; aperture rather narrow, the 

 anal notch quite deep, reaching the suture above, while the lip below 

 is produced forward; the pillar is stout and strong, the canal straight 

 and rather shallow; length of (decollate) shell, 13; diameter of the last 

 whorl at the posterior angle of the aperture, 5; length of last whorl, 

 10 mm. 



Station 3475, in 351 fathoms. No. 107020, U.S.N.M. 



This shell recalls P. chariessa, Watson, but is much smaller and rela- 

 tively much more solid; the wrinkled snbsutural band is absent and 

 the shell is smoother. P. chariessa is an Atlantic species, as far as yet 

 known. The single specimen obtained is somewhat broken; the form 

 of the outer lip is described above from the lines of growth. The 

 nucleus and probably a whorl or two more have been lost from the tip 

 of the spire. 



? PLEUROTOMELLA CLIMACELLA, new species. 

 Plate XXXI, fig. 14. 



Shell slender, small, of five or more (decollate) whorls, covered with 

 a pale straw-colored epidermis, underneath which the shell is porcel- 

 lanous or chalky white; form elongated, slightly constricted in front of 

 the suture, which, especially in the earlier whorls, is bordered by a 

 somewhat irregular nodulous elevated thread; spiral sculpture of sub- 

 equal flattened threads, with wider, irregular interspaces ; these threads 

 are coarser and more distant near the canal, and absent on the anal 

 fasciole; transverse sculpture of irregular, often prominent, lines of 

 growth, and thin, sharp, low, narrow, irregular riblets, with much wider 

 interspaces, more prevalent on the earlier whorls and more or less obso- 

 lete on the last; these ribs tend to nodulate the shoulder and sutural 

 thread when present; aperture less than half the length of the shell, 

 rather narrow, with a wide, short canal, which is not, or but slightly, 

 recurved ; i^illar lip not callous, pillar obliquely truncate in front, rather 

 stout above } outer lip thin, not retiected, the anal notch almost obso- 



