CLASS SCAPHOPODA 
11 
Range. Bering Sea, north of Unalaska, 351 fathoms; off Tillamook 
Bay, Oregon, 786 fathoms; off Point Conception, California, 278 fathoms; 
to off Acapulco, Mexico, 661 fathoms; to Point Aguja, Peru. 
Dentalium agassizii Pilsbry and Sharp, 1897 
Plate 1, fig. 1 
Tryon and Pilsbry, Manual of Conchology, 17:26; PI. 12, figs. 90-94. 
Shell gently curved posteriorly, the latter half nearly straight, tapering, 
solid, white and lusterless (often with a black incrustation toward the 
apex, and reddish-brown on the larger end). Sculpture: at the apex there 
are 12-20 rather sharp and well-raised riblets separated by wider, concave 
intervals; at a varying distance from the apex an interstitial thread appears 
in these intervals, so that near the middle of the shell’s length there are 
double that number of riblets and threads, alternately larger and smaller, 
and at the aperture there are 25-48 unequal riblets and threads, lower and 
blunter in large examples. Aperture somewhat oblique, subcircular, but 
the arc along the concave side is sometimes less curved than the remainder 
of the peristome, and the edge is irregular from breakage. Anal orifice 
small, circular, no slit or notch; but often the inner layer projects tube-like 
from erosion of the softer, more chalky, outer layer. Length, 65; diameter 
at aperture, 4.3; at apex, 0.7 mm. (type). (Pilsbry and Sharp.) 
Type in United States National Museum. Type locality, Gulf of 
Panama. 
Range. Santa Barbara Islands, California, to Panama. 
Dentalium rectius Carpenter, 1864 
Plate 1, fig. 3 
Supplementary Report, British Association for the Advancement of Science, 1863, 
p. 648. Proceedings, Philadelphia Academy of Natural Sciences, 1865, p. 59. 
Tryon and Pilsbry, Manual of Conchology, 17; PI. 21, fig. 45. 
D. t. valde elongata, valde tereti, lentissime augente, vix arcuata; laevi, 
tenuiore, albida, subdiaphana, valde nitente; aperturam versus tenuissima. 
(Carpenter.) 
Shell almost straight, slender and long, attenuated toward the apex, 
thin and fragile, bluish-white, somewhat translucent, with some opaque 
white flecks or rings, often encrusted near the aperture with a reddish 
deposit. Surface very glossy, polished, growth-marks being only faintly 
seen, and sculpture absent. Aperture not oblique, almost circular, but the 
tube is a little compressed laterally; peristome thin. Apical orifice small, 
circular, without notch or slit, but from its extreme fragility the end is 
[ 11 ] 
VICTORIA 
