136 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
second two occur between th second and third, one between the fourth 
and fifth, two between the sixth and seventh. In addition to this sculpture 
there are many microscopic lines of growth and microscopic spiral stria- 
tions. Sutures well-marked. Periphery of the last whorl somewhat 
angulated, marked by the feeble extension of the axial ribs. Base short, 
well-rounded, smooth, excepting the fine lines of growth and exceedingly 
fine, weakly incised spiral striations, among which about nine equal and 
equally spaced are a trifle stronger than the rest. Aperture rhomboid: 
outer lip thin, showing the external sculpture within; columella mod¬ 
erately strong and slightly revolute. Length, 6.9; diameter, 2.2 mm. 
(Dali and Bartsch.) 
Type in United States National Museum, No. 168866. Type locality, 
off Santa Rosa Island, California. 
Range. Santa Rosa Island and Santa Catalina Island, California. 
Turbonilla tenuicula Gould, 1853 
Plate 54, figs. 3, 3a 
Boston Journal of Natural History, 6:383; PI. 14, fig. 15. 
T. gracillima, lanceolata, nitida, cerina, infra suturam fuscescens; 
anfr. 10 planulatis, tabulatis, longitudinaliter ad 20-plicatis, striis numero- 
sis volventibus leviter secatis; basi modo spiraliter strista; apertura anguta, 
ovata; labro acuto. (Gould.) 
Shell small, elongated lanceolate, turreted; rather solid, shining, wax- 
yellow, a little dusky below the suture; whorls ten, flat, slightly shouldered 
above, marked by about twenty direct longitudinal folds, the summits of 
which are cut by numerous fine revolving striae, deeper in the interstices, 
which also extend over the base of the shell, though the folds terminate 
at the periphery or are extended in delicate furrows. Aperture narrow 
ovate, lip sharp; revolving striae apparent in the aperture. Length, three- 
tenths of an inch; diameter one-twentieth of an inch. (Gould.) 
Type in ? Type locality, Santa Barbara, California. 
Range. Monterey, California, to Point Abreojos, Lower California. 
Turbonilla virgo Carpenter, 1865 
Annals and Magazine of Natural History, series 3, 15:396. Bulletin 68, United States 
National Museum; PI. 8, fig. 4. 
C. testa parva, alba, gracili, stylina; anfr. nucl. ii, decliviter sitis, 
margines spirae subparallelos haud superantibus; norm, vii, subrotundatis, 
suturis distinctis; costulis radiantibus circ. xviii, angustis, acutioribus, 
saepe attingentibus, circa peripheriam haud subito evanidis, interstitiis 
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