Pyramidella (Triptychus) hermosa, new species.
San Felipe, Gulf of California (1933). Type 11376, Lowe collection; cotype, California Academy of Sciences.
Shell small, semiopaque, ivory white. Eight moderately rounded whorls, including the smooth nuclear. Rather strongly tabulated at the shoulders. Sculptured by three strong rounded spiral cords, of which the second and third are stronger than the one just below the suture. In addition to the spiral cords, the whorls are marked by axial ribs which are of about equal strength over the entire shell. Their junction with the spiral cords forms prominent tubercles, which are the outstanding part of the sculpture pattern. There are about thirty-two of these axial ribs on the body whorl. Base moderately rounded, marked with a single spiral cord. Outer lip a little thickened and slightly reflexed. Columella covered with a heavy white callus. Diameter 2.4 mm., altitude 6.7 mm.
This very interesting species differs considerably in sculpture from Triptychus olssoni Bartsch from Santa Elena Bay, Ecuador (Proc. U. S. Nat. Muse., vol. 69, pl. 1, fig. 11, 1926), which seems to be the only other species in this group described from this coast except Odostomia pedroana Dall and Bartsch, which was provisionally placed in their new subgenus Iridella.