100 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Turbonilla stylina Carpenter, 1865 
Annals and Magazine of Natural History, series 3, 15:396. Bulletin 68, United States 
National Museum; PI. 3, figs. 7, 7a. 
C. testa “C. torquatae” simili sed valde teretiore, gracillima, interdum 
subdiaphana; anfr. nucl. ii., decliviter sitis, margines spirae fere parallelos 
vix superantibus; norm, xii, angustis, subplanatis, suturis distinctis; costis 
radiantibus circ. xxiii, latis declivibus, testa juniore continuis, adulta fascis 
baud sculpta suprasuturali separatis; interstitiis parvis, baud sculptis; basi 
rotundata, haud sculpta; columella parum torta. Long., .32; long, spin, 
27; lat., 8 poll. (Carpenter.) 
Shell slender, subdiaphanous to milk-white. Nuclear whorls two, 
smooth, depressed, helicoid, scarcely extending beyond the outline of the 
spire and having their axis at right angles to the axis of the succeeding 
turns. Post-nuclear whorls well-rounded, separated by strongly con¬ 
stricted sutures, rather high, ornamented by rather low, broad, rounded, 
sinuous, protractive axial ribs, of which there are sixteen upon the first, 
twenty upon the fifth, and twenty-eight upon the penultimate turn. Inter¬ 
costal spaces moderately depressed, about as wide as the ribs, terminating 
a short distance above the sutures, thus leaving a narrow, smooth band 
between the termination of the ribs and the suture as in T. torquata Gould, 
but not quite as wide as in that species. Periphery of the last whorl 
well-rounded. Base rather short, well-rounded. Entire surface marked 
by very fine wavy spiral striations. Aperture subovate, outer lip thin; 
columella slender, moderately long, slightly twisted, almost vertical. 
(Bartsch.) 
Type in British Museum. Type locality, Santa Barbara, California. 
Range. Monterey, California, to the Coronado Islands. 
Described as Chemnitzia stylina. 
Turbonilla carpenteri Dali and Bartsch, 1909 
Bulletin 68, United States National Museum; PI. 3, figs. 9, 9a. 
Shell long, slender, bluish-white. Nuclear whorls small, two and one- 
half, depressed, helicoid, having their axis at right angles to that of the 
succeeding turns, in the first of which they are about one-fifth immersed. 
Post-nuclear whorls exceedingly high between the sutures, evenly rounded, 
marked by almost vertical axial ribs, which become slightly expanded and 
flattened at the summits. There are eighteen of these ribs upon the first 
to third, twenty upon the fourth to sixth, twenty-two upon the seventh, 
twenty-four upon the eighth and ninth, and twenty-six upon the tenth. 
Upon the penultimate turn they become decidedly irregular and enfeebled. 
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