120 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Turbonilla rinella Dali and Bartsch, 1910 
Canada, Department of Mines, Geological Survey Branch, Memoir No. 14-N, 14; 
PL 1, fig. 2. 
Shell elongate-conic, reddish wax-yellow, a little lighter on the pos¬ 
terior half between the sutures; anterior half of base almost white. 
Nuclear whorls decollated. Posterior two-thirds of the post-nuclear 
whorls between the sutures flattened; anterior third rounding moderately 
toward the periphery; whorls marked by feebly developed, low, broad, 
retractive, axial ribs, which are separated by narrow, shallow, inter¬ 
costal spaces. Of these ribs, twenty-two occur upon the fourth, twenty- 
four upon the fifth and sixth, twenty-six upon the seventh, and about 
forty-two upon the last of the remaining turns. Upon the last they are 
very irregular and even less strongly developed than on the preceding. 
Sutures well-impressed. Periphery of the last whorl somewhat inflated, 
well-rounded, with scarcely any traces of axial sculpture. Entire sur¬ 
face of spire and base marked with numerous wavy, closely spaced, spiral 
striations. Aperture broadly oval; posterior angle acute; outer lip thin; 
columella oblique, slender, and revolute; parietal wall covered with a 
fairly thick callus. Length, 8.5; diameter, 2.3 mm. (Dali and Bartsch.) 
Type in Geological Survey, Ottawa. Type locality, Barkley Sound, 
Vancouver Island, British Columbia. 
Range. Known only from type locality. 
Turbonilla lyalli Dali and Bartsch, 1907 
Plate 52, figs. 6, 6 a 
Proceedings of the United States National Museum, 33:500; PI. 44, fig. 4. 
Shell small and slender with strong sculpture, whitish with a broad 
chestnut band which extends almost halfway over the exposed portion 
of the whorls above the periphery and an equal distance anteriorly over 
the base below the periphery. Nuclear whorls two, closely appressed to 
each other, forming a polished depressed helicoid spire, which does not 
extend beyond the outline of the post-nuclear spire, is not at all im¬ 
mersed and has its axis at right angles to the axis of the succeeding 
turns. Post-nuclear whorls decidedly flattened, moderately contracted 
at the periphery, and slightly shouldered at the summit, ornamented by 
strongly elevated, moderately broad, rounded retractive axial ribs, which 
become somewhat flattened toward the summit and periphery of the 
turns. There are about 22 ribs upon the second, 20 upon the fifth 
and the penultimate turn. Upon the first they are very weakly expressed. 
Intercostal spaces broad, almost double the width of the ribs. Sutures 
strongly impressed. Periphery and base of the last whorl well-rounded, 
marked by the continuations of the axial ribs which extend feebly to the 
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