16 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Cadulus tolmei Dali, 1897 
Plate 1, fig. 9 
Bulletin, Natural History Society of British Columbia, No. 2:13; PI. 1, fig. 8. 
Shell small, thin, polished, translucent bluish-white, rather arcuate and 
rapidly tapering behind, the anterior orifice oblique, nearly circular, the 
posterior orifice circular, simple; sculpture none or only of obscure incre¬ 
mental lines. Length of shell, 12; maximum diameter, 2; minimum diame¬ 
ter, 0.7 mm. (Dali.) 
Type in Ottawa. Type locality, near Victoria, British Columbia, in 
60 fathoms. 
Range. Vancouver Island, British Columbia, to San Quentin Bay, 
Lower California. 
Cadulus californicus Pilsbry and Sharp, 1898 
Plate 1, fig. 8 
Tryon and Pilsbry, Manual of Conchology, 17:180; PI. 34, figs. 5, 6, 7, 8. 
Shell large and solid, well-curved; smooth and glossy, growth-lines 
being very faintly indicated; opaque white, the posterior half bluish, sub- 
translucent, with a similarly colored rim at the mouth, or sometimes 
slightly bluish throughout. Stout, decidedly swollen anteriorly, the greatest 
diameter contained 4% to 4% times in the length of shell; the equator 
about at the anterior fourth, either oblique, well-marked and slightly sub- 
angular, or less distinct and gently rounded, tapering rapidly toward both 
ends; outline of concave side noticeably convex in the region of greatest 
swelling. Section of tube a trifle flattened between the convex and con¬ 
cave sides at the equator or throughout. Aperture subcircular, somewhat 
oblique. Anal orifice rather large, slightly oval, with no noticeable callus 
within; its edge irregular from breakage, but possibly two lateral nicks 
may be normally present. Length, 14.3; antero-posterior diameter at 
aperture, 2.25; at largest, 3.33; at apex, 1.0; lateral diameter at aperture, 
2.3; at largest, 3.4; at apex, 1.1 mm. (Pilsbry and Sharp.) 
Type in United States National Museum, No. 107698. Type locality ? 
Range. Clarence Strait, Alaska, to Manta, Ecuador. 
Cadulus stearnsii Pilsbry and Sharp, 1898 
Plate 1, fig. 6 
Tryon and Pilsbry, Manual of Conchology, 17:253; PI. 27, figs. 88, 89. 
Shell short, decidedly curved, the bend mainly in the posterior half, 
very rapidly enlarging, tapering regularly from the largest aperture to 
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