CLASS GASTROPODA 
107 
straight, and somewhat revolute, provided with an obsolete oblique fold a 
little anterior to its insertion; parietal wall glazed by a fine callus. Length, 
4.2; diameter, 1.3 mm. (Bartsch.) 
Type in United States National Museum, No. 268719. Type locality, 
United States Steamer “Albatross” at Station 5678, off Redondo Point, 
Magdalena Bay, Lower California. 
Range. Known only from type locality. 
Subgenus Pyrgolampros Sacco, 1892 
Turbonilla ridgwayi Dali and Bartsch, 1909 
Plate 52, figs. 10, 10a 
Bulletin 68, United States National Museum, 62; PI. 6, figs. 10, 10a. 
Shell robust, brown. Nuclear whorls two and one-half, moderately 
large, forming a depressed helicoid spire, the axis of which is almost 
at right angles to that of the succeeding turns, in the first of which they 
are about one-fourth immersed. Post-nuclear whorls flattened in the 
middle, rounded at the moderately strong shoulder at the summit, and 
at the periphery; marked by strong, well-elevated, rounded, almost vertical 
axial ribs, which are slightly contracted in the middle and somewhat 
sinuous. Of these ribs, eighteen occur upon the third to sixth and twenty 
upon the penultimate whorl. Intercostal spaces well-impressed, decidedly 
so in the middle, a little wider than the ribs. Sutures strongly marked, 
rendered sinuous by the ribs at the summits of the whorls. Periphery 
of the last whorl well-rounded. Base moderately long, well-rounded, 
marked by the feeble continuations of the axial ribs. Entire surface of 
the base and spire marked by closely crowded, wavy, well-incised spiral 
striations. Aperture moderately large, oval; posterior angle acute; outer 
lip thin, showing the external sculpture within; columella moderately 
strong, somewhat curved and revolute, provided with a weak oblique fold 
at its insertion. Length, 4.6; diameter, 2 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 162560. Type locality, 
San Diego, California. 
Range. Known only from type locality. 
Turbonilla victoriana Dali and Bartsch, 1907 
Plate 50, fig. 3 
Proceedings of the United States National Museum, 33:501; PI. 44, fig. 6. 
Shell elongate-conic, wax yellow to light brown. Nuclear whorls and 
the early succeeding turns eroded in all the specimens examined. Post- 
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