BALL: MOLLUSCA AND BRACHIOPODA. 251 



nearly uniformly sculptured with (on the penultimate whorl 17) sharp, narrow, 

 equal and equidistant, sliglitly retractive axial ribs, separated by wider shallow 

 interspaces, crossed by (between the sutures 3-5) spiral cords which become 

 slightly nodulous at tlie intersections ; the spirals are uniformly spaced except at 

 the summit, where there are two closely adjacent which may unite as a prcsutural 

 baud, or remain divided like the others ; at the periphery of the base is a narrower 

 cord separated from those behind by a wider space; tlie suture is coiled on this 

 keel, while tlie s]>ace 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 siplional fasciole, wliich is sometimes bordered by a keel, wliich on the 

 adult pillar is lost in the thick callus ; canal short, wide, recurved ; outer lip thin, 

 throat not Urate. 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 Dall, 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 uodulalion 

 by three obscure flatlish 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 ])Osferior 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 ^Frs. Burton Williamson. 



This species, which had been regarded as a variety of T. plica ta Gray, resem- 

 bles that species but is smaller and more slender. The specimens had been in the 

 coUectiou many years. Further search will doubtless show it to be extended 

 southward in its geographical range. 



