DALL: MOLLUSCA AND BRACHIOPODA. 251 
nearly uniformly sculptured with (on the penultimate whorl 17) sharp, narrow, 
equal and equidistant, slightly retractive axial ribs, separated by wider shallow 
interspaces, crossed by (between the sutures 3-5) spiral cords which become 
slightly nodulous at the intersections ; the spirals are uniformly spaced except at 
the summit, where there are two closely adjacent which may unite as a presutural 
band, or remain divided like the others ; at the periphery of the base is a narrower 
cord separated from those behind by a wider space; the suture is coiled on this 
keel, while the space behind it gives the effect of a channelled suture; on the base 
the ribs extend toward the canal, the spirals are smaller than those between the 
sutures, and about seven in number, but owing to the obsolescence of the ribs 
they are not tuberculate and form no distinct reticulations ; the base is constricted 
above the siphonal fasciole, which is sometimes bordered by a keel, which on the 
adult pillar is lost in the thick callus ; canal short, wide, recurved ; outer lip thin, 
throat not lirate. Lon., 22; max. diam., 6 mm. 
U.S. S. “ Albatross,” station 3291, Gulf of Panama, in 153 fathoms, mud, 
bottom temperature 55°.8 F. U.S. N. Mus., 123,084. 
Also at station 2834, in 48 fathoms, mud, off the west coast of Lower California, 
in latitude 26° 14’ N. near Ballenas Bay, bottom temperature 53°.9. 
The reticulation of this species is so close and strong that the sutural band is 
rendered quite inconspicuous. 
Terebra (Strioterebrum) pedroana Da tt, n. sp. 
Shell small, slender, acute, apex (slightly decollate); subsequent whorls flattened, 
about eleven in number, the sutural band, on the early whorls, axially undulate 
by the prolongations of the ribs across the feeble sulcus to the suture ; axial sculp- 
ture of numerous, nearly vertical, low, narrow riblets with wider interspaces, pro- 
portionately less marked on the last whorl; these are crossed without nodulation 
by three obscure flattish spiral bands, with one or two narrower and more thread- 
like, and on the base of the last whorl six or seven more feeble spirals of the same 
sort, all with narrower feebly channelled interspaces; aperture narrow behind a 
thin callus and anterior keel on the pillar; outer lip thin, sharp; canal very short, 
recurved, bordered by a prominent sharp keel on the posterior edge of the 
siphonal fasciole, hardly visible on the pillar but perceptible within the whorls; 
color bluish white with irregular blotches of yellowish brown, or all brownish. 
Lon. of (decollate) shell, 32; of last whorl, 12; of aperture, 8; max. diam., 6.5 mm. 
U. S. Nat. Museum 118,806 and 32,772, both from San Pedro, California, 
Stearns and Mrs. Burton Williamson. 
This species, which had been regarded as a variety of 7. plicata Gray, resem- 
bles that species but is smaller and more slender. The specimens had been in the 
collection many years. Further search will doubtless show it to be extended 
southward in its geographical range. 
