38 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.56. 



is a minute protiactively looped sculpture giving a vermicular aspect 

 to the surface under a magnifier; aperture ovate, simple, the outer 

 lip thin and sharp, the anal sulcus wide and moderately deep, the 

 pillar straight, attenuated in front, the plait hidden behind it, the 

 canal short and wide, the operculum missing. Height of shell, 29; of 

 last whorl, 20; diameter, 12 mm. Cat. No. 96841, U.S.N.M. 



Range. — Off Santa Barbara Island, California, in 302 to 614 

 fathoms, sand, bottom temperature 41.4° F. U. S. Bureau of Fish- 

 eries steamer Albatross. 



In these species the plait on the pillar is generally hidden behind 

 the pillar so as to be invisible from a front view of the aperture. 



BORSONELLA NYCKIA, new species. 



Plate 12, fig. 2. 



Shell white with an olivaceous periostracum, biconic, acute, the 

 nucleus (eroded) of one or two whorls, with about six subsequent 

 whorls, rapidly enlarging, flatl}' descending from a distinct, not ap- 

 pressed suture to the periphery and with the last whorl conically at- 

 tenuated in front; spiral sculpture of an obscure thickening in 

 front of the suture, fine rather irregular striae thence to the pe- 

 riphery, crossed obliquely by irregular scratches, a prominent angle 

 at the i^eriphery which on the spire is just behind the suture, and on 

 the last whorl is ornamented with nine or ten prominent nodules 

 with wider interspaces; on the base the striae are coarser and more 

 irregular, the interspaces assuming the form of (about 15) flattish 

 threads, sparser on the canal ; axial sculpture of fine incremental lines 

 arcuate on the anal fasciole; aperture elongate triangular, the anal 

 sulcus very wide and shallow, outer lip thin, sharp, smooth within, 

 arcuate in front of the periphery; inner lij) erased, pillar solid, short 

 with a single plication near the body, attenuated in front, straight; 

 canal hardly differentiated, somewhat produced. Height of shell, 

 12 ; of last whorl, 8 ; diameter, 5.5 mm. Cat. No. 208891, U.S.N.M. 



Range. — Station 4361, off Point Loma, California, in 101 fathoms, 

 sandy bottom; U. S. Bureau of Fisheries. 



BORSONELLA OMPHALE, new species. 



Plate 12, fig. 4. 



Shell slender, acute, with eight flattish whorls exclusive of the 

 (lost) nucleus, white covered by a very light olive gray periostracum; 

 suture distinct, fasciole hardly impressed : spiral sculpture of obscure 

 striae, sparser on the base ; axial sculpture of incremental faint lines 

 arcuate on the anal fasciole; aperture narrow, anal sulcus wide, mod- 

 erately deep ; outer lip thin, prominently arcuate in front of the pe- 

 riphery; inner lip erased, pillar strong with a single fold near the 

 body ; attenuated in front ; canal short. Height of shell, 16 ; of last 

 whorl, 10; diameter, 6 mm. Cat. No. 209174, U.S.N.M. 



