300 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
ture of (on the last whorl about fifteen) 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 vertically 
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 ae He) 8 
max. diam. 5.5 mm. 
U.S. 8. ‘ 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. occidentalis Stearns, and the P. lig- 
atus Mighels, of New Kngland 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. 
Fasciolariidae. 
SOLENOSTEIRA Datu. 
Solenostetra Dall, Trans. Wagner Inst., 1890, 3, p. 122; type, Pyrula anomala Reeve, 
Conch. Icon., 1847, Pyrula, pl. 8, fig. 12. 
Solenosteira elegans Da tt, 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 the whorls, and faint incremental lines emphasized by prominences of 
the periostracum; spiral sculpture of (between the sutures three and on the last 
whorl six or seven) major prominent cords, between which are 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, not reflected, with 
about fifteen spiral lirae within, the anterior one largest ; inner lip white, callous, 
with three or four faint subsutural lirae in the fully adult shell, otherwise quite 
smooth; canal short, wide, recurved; siphonal fasciole prominent; operculum 
