300 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



ture of (on the last whorl about fifteeu) low rounded nearly vertical ribs, with about 

 equal interspaces, which are strongest at the periphery and gradually become 

 weaker in each direction, and obsolete on the base ; the periostracum is Tertically 

 wrinkled, but the incremental lines are not conspicuous; spiral sculpture of (on 

 the penultimate whorl six or seven, on the last whorl about twenty), flattish spiral 

 threads with subequal or slightly narrower channelled interspaces, this sculpture 

 extending to the tip of the canal; these threads override the ribs but without 

 turgidity at the intersections; aperture elongate, ovate; outer lip simple, sharp, 

 not reflected ; inner lip not callous, pillar short, obliquely attenuated ; canal short, 

 recurved, narrow ; on the pillar one feeble plait is visible at the aperture, further 

 back there are two, and in the spire three with faint indications of a possible 

 fourth plait, oblique and rather close together near the anterior edge of the pillar. 

 Length of shell (nucleus defective), 11.0; of last whorl, 8.5 ; of aperture, 5.5; 

 max. diam. 5.5 mm. 



U. S. S. "Albatross," station 2923, off San Diego, California, in 822 fathoms, 

 mud, bottom temperature 39° F. U.S. N. Mus. 193,650. 



This little shell differs from the boreal P. ocridentalis Stearns, and the P. lig- 

 atm Migliels, of New England in having axial ribbing and more than two plaits, 

 as well as in its color. The operculum is ovate, concentric, and has an apical 

 nucleus. 



Fasciolariida e . 



SOLENOSTEIRA Dall. 



Solenosteira Dall, Trans. Wagner Inst., 1890, 3, p. 122 ; type, Pyrula anomala Reeve, 

 Conch. Icon., 1847, Pyrula, pi. 8, fig. 12. 



Solenosteira elegans Dall, n. sp. 



Plate 5, figure 6. 



Shell solid, large, white, with a somewhat villous olivaceous periostracum ; short 

 fusiform, with a nucleus of two and about five and a half subsequent, rapidly 

 enlarging whorls ; nucleus smooth, turgid, blunt ; axial sculpture of (on the last 

 whorl ten) strong, prominent, rounded, nearly vertical ribs, with wider interspaces, 

 crossing tlie whorls, and faint incremental lines emphasized by prominences of 

 the periostracum; spiral sculi)ture of (between the sutures three and on the last 

 whorl six or seven) major prominent cords, between which arc from three to 

 seven finer threads, the former a little turgid where they override the ribs ; suture 

 distinct, deep, not appressed ; aperture oval, outer lip sharp, )iot reflected, with 

 about fifteen spiral lirac within, the anterior one largest ; inner lip white, callous, 

 with three or four fuiut subsutural lirac in the fully adult shell, otherwise quite 

 smootii ; canal short, wide, recurved ; siphonal fasciole prominent ; operculum 



