CLASS SCAPHOPODA 
17 
the apex; thin, bluish-white, a little translucent, more or less flecked with 
opaque white (by incipient surface decay), or with eroded spots. Glossy, 
with close, fine, distinct growth-striae, very obliquely passing around the 
tube, bending backward on the convex, forward on the concave side; in 
most specimens also showing faint, low traces of longitudinal cords on 
the convex side. Aperture somewhat wider than long, quite oblique, the 
peristome thin. Anal orifice circular, simple when perfect, but often with 
irregular, broken edge. Length, 8.6; diameter at aperture antero-pos- 
tenorly, 1.75; laterally, 1.9; diameter at apex, 0.7 mm. (Pilsbry and 
Sharp.) 
Type in United States National Museum, No. 107700. Type locality, 
oft* Tillamook Harbor, Oregon, in 786 fathoms. 
Range. British Columbia to San Quentin Bay, Lower California. 
This is a new name for C. simplex Pilsbry and Sharp, 1897, not 
D. simplex Michelotti, 1861. It was described as Dentalium stearnsii, 
Pilsbry and Sharp. 
Cadulus aberrans Whiteaves, 1887 
Transactions of the Royal Society of Canada, 4: sec. 4, p. 124, fig. 2. 
Shell slender, moderately but distinctly curved, large and much elon¬ 
gated for the genus, increasing very slowly but regularly in diameter, not 
distinctly (if at all) swollen in advance of the middle, and very slightly 
and scarcely perceptibly constricted immediately behind the aperture. 
Testa extremely thin, surface polished, very glossy and shining, smooth to 
the naked eye, but under a lens it is seen to be marked with minute and 
transverse but somewhat oblique lines of growth. Length, 13.5; breadth, 
1.3 mm. (Whiteaves.) 
Type in Ottawa. Type locality, Quatsino Sound, British Columbia. 
Range. Known only from type locality. 
Cadulus perpusillus Sowerby, 1832 
Proceedings, Zoological Society of London, 29. 
Dent, testa minima, tenui, angusta, curva, polita, alba; apice acuto; 
apertura coarctata, obliqua. Long., % 0 J lat., Vio poll. (Sowerby.) 
Shell small, thin, narrow, curved, polished, and white. Apex acute; 
aperture contracted, oblique. (Tryon and Pilsbry, Manual of Conchology.) 
Type in British Museum. Type locality, Puerto Salango, west coast 
of Colombia. 
Range. Monterey, California, to Panama. 
