CLASS GASTROPODA 
111 
Turbonilla gouldi Dali and Bartsch, 1909 
Plate 52, figs. 1, 1 a 
Bulletin 68, United States National Museum, 66; PI. 6, figs. 1, la. 
Shell slender, light brown. Nuclear whorls small, two, depressed, 
helicoid, having their axis almost at right angles to that of the succeeding 
turns, in the first of which they are slightly immersed. Post-nuclear whorls 
increasing regularly in size, marked by low, rounded, feebly developed 
axial ribs, of which there are 24 upon the second and fourth, 20 upon the 
fifth to eighth, 22 upon the ninth and penultimate turn. Intercostal spaces 
narrow and shallow. Sutures moderately impressed. Periphery of the last 
whorl well-rounded, somewhat inflated. Base short, inflated. Entire sur¬ 
face of spire and base covered by numerous fine, closely spaced, wavy spiral 
striations. Aperture oval; posterior angle acute; outer lip thick within, 
thin at edge; columella moderately long, sinuous, and slightly reflected. 
The above description is based on two cotypes, one No. 163256a, from 
San Pedro, California, has furnished the description of the nuclear and 
early whorls; the other, No. 159990, also from San Pedro, consisting of 
the last seven whorls, has furnished the adult characters. Length of first 
specimen, 5.8; diameter, 2 min.; of second adult, specimen, length, 6.1; 
diameter, 2 mm. (Dali and Bartsch.) 
Cotypes in United States National Museum, Nos. 163256a, and 
159990. Type locality, San Pedro, California. 
Range. Santa Rosa Island to San Diego, California. 
Turbonilla halia Dali and Bartsch, 1909 
Plate 50, fig. 11 
Bulletin 68, United States National Museum, 68; PI. 5, fig. 11. 
Shell elongate-conic, wax-yellow at the summit, grading to brown at 
the suture; anterior part of the base, wax-yellow. (Nuclear whorls decol¬ 
lated.) Post-nuclear whorls flattened in the middle, rounding gently 
toward the summit and the suture, marked by low, broad, well-rounded, 
slightly protractive, axial ribs, of which 16 occur upon the second, 18 upon 
the third and fourth, 20 upon the fifth to seventh, 24 upon the eighth, 
and 28 upon the penultimate turn; upon this they are less regular, some¬ 
what enfeebled and retractive. Intercostal spaces a little narrower than the 
ribs. Sutures well-impressed. Periphery of the last whorl well-rounded. 
Base moderately long, well-rounded. Entire surface of spire and base 
marked by numerous fine, crowded, wavy, spiral striations. Aperture oval; 
posterior angle acute; outer lip thin, showing the external sculpture and 
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