252 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
Terebra (Strioterebrum) balaenorum Datt, n. sp. 
Shell small, slender, acute, whitish flesh-color, with occasional brown flecks, or 
all pale brown, with about fifteen whorls, of which the apical three are glassy, 
smooth, and brownish; subsequent whorls flattish, with a well-marked nodulous 
presutural band and impressed sulcus; the nodules are subrectangular, correspond- 
ing to the axial ribs, which are feeble, moderately retractively arcuate and about 
seventeen in number on the penultimate whorl; in front of the band are six or 
seven flattish straplike or threadlike spiral little-elevated ridges, irregular in width 
with narrower interspaces and obscure very fine spiral striation visible on top of 
the ridges here and there, the base being similarly sculptured with rather narrower 
ridges; all the ridges are slightly nodulous or wavy when interrupted by the ribs ; 
aperture elongate, lozenge-shaped, the outer lip thin, imer lip polished but not 
callous, pillar hardly keeled; canal reduced to a notch, siphonal fasciole with a 
sharp posterior keel. Lon. of shell, 27.0; of last whorl, 10.5; of aperture, 7.0; 
max. diam., 6.0 mm. 
U. 8. S. “Albatross,” station 2835, off Ballenas Bay, west coast of Lower 
California, in five and a half fathoms, mud. U.S8. N. Mus. 110,599; also at La 
Paz, Gulf of California, by W. J. Fisher. 
This species is somewhat like Reeve’s figure of Zerebra serotina Adams and 
Reeve, from Japan, which, however, is a larger species, has a double band of 
nodules and a callous inner lip. 
Terebra (Strioterebrum) lucana, Da tt, n. sp. 
Shell small, straw-colored, acute, with about fourteen whorls, the apex blunt 
and slightly swollen and, with the following whorl, glassy, smooth, and polished ; 
subsequent whorls flat, regularly increasing, with a rather wide, closely vertically 
ribbed presutural band, which is also closely spirally evenly threaded with about 
five threads ; the sulcus is marked by a series of rather deep punctations between 
the raised axial sculpture; body of the penultimate whorl with about thirty-two 
similar narrow, low, nearly vertical, wave-like ribs which are also prolonged 
across the band and are separated by rather wider interspaces; these are crossed 
between the sulcus and the next preceding suture by about a dozen even, nearly 
uniform and uniformly spaced spiral threads with narrower interspaces which 
have an almost punctate appearance from the fine reticulation; similar threads 
and. the anterior prolongations of the ribs cover the base ; aperture narrow, rather 
long; outer lip simple, inner lip slightly glazed; pillar with two distinct rounded 
plaits; canal distinct ; fasciole lamellose with a strong posterior keel. Lon. of 
shell, 36; of last whorl, 14; of aperture, 9; max. diam., 7 mm. 
U.S. 5S. ‘ Albatross,” station 2830, west of the southern extreme of Lower 
California, in 66 fathoms, sand, bottom temperature 74° F. U.S. N. Mus. 96,567. 
This species is nearest to 7. hindsit Deshayes (not Carpenter) from China, but 
is more regularly conical and acute, the whorls flatter with a relatively wider 
