108 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
nuclear whorls quite high between the sutures, somewhat concave in the 
posterior two-thirds of the exposed portion, only slightly contracted 
toward the periphery and faintly shouldered at the summit; ornamented 
by low, rounded, somewhat sinuous axial ribs, which are about as wide 
as the shallow intercostal spaces. Sutures well-marked. Periphery and 
base of the last whorl somewhat inflated, marked by weak continuations 
of the axial ribs, which extend feebly to the umbilical region. Entire 
surface crossed by numerous, wavy spiral striations. Aperture rather 
elongate, oval, outer lip thin; columella moderately long, decidedly twisted 
and somewhat revolute in its free anterior portion; the twist at its in¬ 
sertion appearing as a fold. Length, 7; diameter, 2.1 mm. (Dali and 
Bartsch.) 
Type in United States National Museum, No. 126660a. Type locality, 
Victoria, Vancouver Island, British Columbia. 
Range. Known only from type locality. 
Turbonilla valdezi Dali and Bartsch, 1907 
Plate 52, fig. 8 
Proceedings of the United States National Museum, 33:502; PI. 44, figs. 3, 3a. 
Shell inflated, robust, broad and stumpy, of light, fulvous coloration. 
Nuclear whorls decollated in the type. Post-nuclear whorls flattened, some¬ 
what contracted at the periphery and rounded at the summit, traversed 
by broad, coarse, irregularly slanting, axial ribs, which extend over the 
inflated periphery of the last whorl to the umbilical region, appearing less 
prominent on the base. About 16 of these ribs occur upon the second, 18 
upon the fifth, and 24 upon the penultimate post-nuclear whorl. Entire sur¬ 
face of the shell crossed by very minute, close spiral striation. Suture 
subchanneled and wavy. Aperture ovate, outer lip thin, joining the twisted 
and revolute columella in a broad curve. Length, 5.6; diameter, 2.1 mm. 
(Dali and Bartsch.) 
Type in United States National Museum, No. 32273. Type locality, 
Monterey, California. 
Range. Barkley Sound, Vancouver Island, to Monterey, California. 
Turbonilla newcombei Dali and Bartsch, 1907 
Plate 52, fig. 3; Plate 54, fig. 6 
Proceedings of the United States National Museum, 33:45; fig. 6. 
Shell regularly, broadly conic, white on the posterior half and light 
brown on the anterior half of the exposed portion of the whorl; base white. 
Nuclear whorls decollated in all the specimens seen. Post-nuclear whorls 
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