CLASS GASTROPODA 
261 
obtuse; outer lip thin, showing the external sculpture within, decidedly 
sinuous at the edge; inner lip rendered decidedly flexuous; parietal wall 
covered by a thin callus. Length, 5; diameter, 1.7 mm. (Bartsch.) 
Type in United States National Museum, No. 225185. Type locality, 
U.S. Bureau of Fisheries, Station 4205, in 60 fathoms, Queen Charlotte 
Sound, British Columbia. 
Range. Queen Charlotte Sound, British Columbia, to Puget Sound, 
Washington. 
Cerithiopsis montereyensis Bartsch, 1911 
Proceedings of the United States National Museum, 40:363; PI. 41, fig. 5. 
Shell small, broadly conic, light brown. (Nuclear whorls decollated.) 
Post-nuclear whorls marked by three spiral cords, the first of which 
(very poorly developed, in fact almost obsolete on the early whorls) 
is at the summit, while the next is separated from it by a narrow 
channel, the third being about as far posterior to the suture as the second 
is from the first, and the space between the second and third being double 
the width of that between the first and second. In addition to the spiral 
cords, the whorls are marked by vertical, axial ribs which are equal to 
the spiral cords in strength. Of these ribs, 15 occur upon the second and 
third, 16 upon the fourth and fifth, 18 upon the sixth, and 22 upon the 
penultimate turn. The junctions of the axial ribs and spiral cords form 
cusp-like tubercles, while the spaces inclosed between them are very 
elongate, rectangular pits between the first and second spiral cord, and 
strongly impressed, squarish pits between the second and third. Suture 
well-impressed. Periphery of the last whorl marked by a narrow keel 
which is separated from the supraperipheral keel by a sulcus as wide as 
that separating the first from the second spiral cord, and crossed by the 
continuations of the axial ribs which terminate at its posterior border. 
Base short, slightly rounded, ornamented with three narrow, spiral keels, 
of which the first two are much stronger than the other. These keels are 
equally spaced between the periphery and the middle of the base, which 
is occupied by the last one. In addition to the above sculpture, the entire 
surface of spire and base is marked by numerous, fine incremental lines. 
Aperture subquadrate, decidedly channeled anteriorly; posterior angle 
obtuse; outer lip rendered strongly wavy by the external sculpture, which 
is apparent in the aperture; columella short, stout, curved, and decidedly 
twisted, the free edge reflected; parietal wall glazed with a thin callus. 
Length, 3.2; diameter, 1.3 mm. (Bartsch.) 
Type in United States National Museum, No. 32395. Type locality, 
Monterey Harbor, California. 
Range. Little River, Mendocino County, to Monterey, California. 
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