130 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Turbonilla eva Bartsch, 1917 
Plate 51, fig. 6 
Proceedings of the United States National Museum, 52: 651; PI. 44, fig. 6. 
Shell small, elongate-conic, of pale-brown ground color, with the 
incised spiral lines red. Nuclear whorls decollated. Post-nuclear whorls 
gently rounded, on the posterior three-quarters of the shell sloping more 
abruptly toward the suture, marked by moderately strong, well-rounded, 
almost vertical axial ribs, of which twenty-two occur upon the third and 
fourth, twenty- four upon the fifth, and twenty-six upon the penultimate 
turn. Intercostal spaces a little narrower than the ribs, crossed by eleven 
strongly incised spiral grooves, which are of varying width. Of these 
the fourth, seventh, and eleventh are of equal strength and much wider 
than any of the rest; the remaining, with the exception of the sixth, 
which is a mere incised line, are of almost equal strength. In spacing 
the first is about as far below the summit as that is distant from the 
second, and these two spaces are a little wider than the spaces between 
the third and fourth, the fifth and sixth, and the seventh and eighth, 
which are equal and follow next in strength; the remaining spaces are 
subequal and a little narrower. Sutures quite strongly constricted. Pe¬ 
riphery of the last whorl inflated, well-rounded. Base moderately long, 
well-rounded, marked by feeble continuations of the axial ribs, which 
become evanescent before reaching the middle of the base, and thirteen 
subequally spaced incised spiral lines, of which the first three below the 
periphery are interrupted by the ribs. Aperture oval, posterior angle 
obtuse; outer lip very thin; inner lip slightly curved, reflected over and 
appressed to the base; parietal wall covered with a thin callus. Length, 
4.3; diameter, 1.2 mm. (Bartsch.) 
Type in United States National Museum, No. 250630. Type locality, 
off San Diego Bay, California. 
Range. Known only from type locality. 
Turbonilla signae Dali and Bartsch, 1909 
Plate 55, fig. 1 
Bulletin 68, United States National Museum, 83; PI. 7, fig. 1. 
Shell elongate-conic, of very regular outline, wax-yellow, variegated 
with ashy. (Nuclear whorls decollated.) Post-nuclear whorls very flat, 
with appressed summits, scarcely at all contracted at the periphery, marked 
by low, rounded, slightly sinuous, somewhat protractive axial ribs, of 
which twenty-two occur upon the second, twenty-four upon the third, 
twenty-six upon the fourth, twenty-eight upon the fifth, thirty upon the 
sixth, thirty-six upon the seventh, forty-six upon the eighth, and of 
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