104 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Type in United States National Museum, No. 4104. Type locality, 
Cape San Lucas, Lower California. 
Range. San Diego, California, to Cape San Lucas, Lower California. 
Turbonilla kincaidi Bartsch, 1921 
Proceedings of the Biological Society of Washington, 34:33. 
Shell rather broadly elongate-conic, yellowish white. Nuclear whorls 
decollated. The remaining turns are moderately well rounded and some¬ 
what overhanging, appressed at the summit, decidedly constricted at the 
suture, marked by rather depressed, slightly retractively slanting axial 
ribs, of which eighteen occur upon the first of the remaining turns, and 
twenty upon all the other turns. The spaces which separate the ribs are 
moderately impressed and terminate roundly about one-eighth of the 
distance between the summit and the suture. Periphery of the last whorl 
well-rounded. Base short, inflated, well-rounded, marked by the feeble 
continuation of the axial ribs, which become evanescent before reaching 
the umbilicus. In addition to the foregoing sculpture the entire surface of 
the spire and base is marked by very fine, closely spaced, spiral striations. 
Aperture rather large, very broadly oval, almost subquadrate; posterior 
angle obtuse; outer lip thin, showing the external sculpture within; inner 
lip slender, somewhat sinuous, reflected over and appressed to the base 
for three-fourths of its length; parietal wall covered by a moderately thick 
callus. Length, 5.5; diameter, 1.7 mm. (Bartsch.) 
Type in United States National Museum, No. 340844. Type locality, 
Dogfish Bay, Puget Sound. 
Range. Puget Sound, Washington. 
Turbonilla dracona Bartsch, 1912 
Proceedings of the United States National Museum, 42 :266; PI. 35, figs. 2, 2a. 
Shell very elongate-conic, bluish-white. Nuclear whorls small, two, 
helicoid, having their axis at right angles to that of the succeeding turns. 
Post-nuclear whorls well-rounded, somewhat shouldered at the summit, 
marked by strong, somewhat curved, decidedly protractive, axial ribs, 
which extend undiminished from the summit to the periphery, between the 
sutures, while on the last whorl they continue feebly over the base. Of 
these ribs, fourteen occur upon the first, sixteen upon the second, eighteen 
upon the third to eighth, twenty upon the ninth and tenth, and twenty-two 
upon the penultimate turn. Intercostal spaces about one and one-half 
times as wide as the axial ribs, deep. Sutures deeply impressed, rendered 
sinuous by the summits of the ribs. Periphery and the short base of the 
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