CLASS GASTROPODA 
139 
marked by the feeble continuations of the axial ribs which gradually 
disappear after crossing the periphery, and about sixteen subequally 
spaced incised spiral lines. Aperture oval, somewhat effuse anteriorly, 
columella oblique, somewhat twisted with a weak oblique fold a little 
anterior to its insertion. (Dali and Bartsch.) 
Type in United States National Museum, No. 196229. Type locality, 
off Del Monte, Monterey, California. 
Range. Known only from type locality. 
Turbonilla almo Dali and Bartsch, 1909 
Plate 53, figs. 8, 8a 
Bulletin 68, United States National Museum, 95; PI. 9, figs. 8, 8a. 
Shell slender, light-brown, wax-yellow at tip. Nuclear whorls very 
small, two and one-half, planorboid, having their axis at right angles to 
that of the succeeding turns, in the first of which they are slightly im¬ 
mersed. First post-nuclear whorls almost smooth, the second with a mere 
indication of ribs, well-rounded. The remaining post-nuclear whorls some¬ 
what overhanging, appressed at the summit, well-rounded, marked by 
moderately developed, rounded, retractive axial ribs, of which about 20 
occur upon all but the penultimate whorl; upon this there are 22. Inter¬ 
costal spaces a little wider than the ribs, marked by seven deep pits of un¬ 
equal width and unequal spacing. Base well-rounded, marked by the feeble 
continuations of the axial ribs, and nine, irregular, wavy, incised, spiral 
lines, the first two of which below the periphery are interrupted. Aperture 
ovate; posterior angle acute; outer lip thin, showing the external markings 
within; columella slender, very oblique, somewhat flexuose and revolute, 
with a slight fold at its insertion. Length, 4.6; diameter, 1.2 mm. (Dali 
and Bartsch.) 
Type in United States National Museum, No. 162633. Type locality, 
off San Diego, California. 
Range. Known only from type locality. 
Turbonilla grippi Bartsch, 1912 
Proceedings of the United States National Museum, 42:270; PI. 36, fig. 9. 
Shell very elongate-conic, light chocolate-brown. (Nuclear whorls 
decollated.) Post-nuclear whorls well-rounded, slightly shouldered about 
one-third of the distance between the sutures, anterior to the summit, 
marked by rather strong, decidedly retractive, axial ribs, of which 20 occur 
upon the second, 18 upon the third to sixth, 20 upon the seventh, 26 upon 
the eighth to tenth, and 30 upon the penultimate whorl; upon the last five 
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