94 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
showing the external sculpture within; inner lip slender, curved, and re¬ 
flected, the posterior edge touching the body whorl; parietal wall covered 
with a moderately thick callus, which renders the peritreme complete. 
Length, 2.3; diameter, 1.1 mm. (Bartsch.) 
Type in United States National Museum, No. 160114. Type locality, 
Monterey, California. 
Range. Sitka, Alaska, to Monterey, California. 
Alvania rosana Bartsch, 1911 
Plate 82, fig. 6 
Proceedings of the United States National Museum, 41:349; PI. 31, fig. 6. 
Shell broadly ovate, yellowish white. Nuclear whorls two and one-half, 
smooth, well-rounded. Post-nuclear whorls well-rounded, marked by nar¬ 
row, well-rounded, somewhat sinuous, almost vertical, axial ribs, which are 
about one-third as wide as the spaces that separate them. Of these ribs 24 
occur upon the second and the penultimate turn. In addition to the axial 
sculpture the whorls are marked by low, rounded, equal and equally spaced 
spiral cords, which are a little weaker than the axial ribs. Of these cords 
6 occur between the sutures on the second turn and 7 on the penultimate 
turn, the first being at the summit. These spiral cords are a little narrower 
than the spaces that separate them. Suture moderately constricted. Periph¬ 
ery of the last whorl inflated, marked by a sulcus which is as wide as the 
spaces that separate the cords on the spire and, like them, crossed by the 
continuations of the axial ribs, which terminate at the posterior border of 
the first basal keel. Base strongly rounded, narrowly umbilicated, very 
slightly attenuated anteriorly, marked by eight equal and equally spaced 
spiral cords, which are about as wide as the spaces that separate them. 
Aperture broadly oval; posterior angle obtuse; outer lip thick; re-enforced 
immediately behind the edge by a moderately thick callus; inner lip strongly 
curved and somewhat reflected over and partly appressed to the base; 
parietal wall covered with a moderately thick callus. Length, 2.6; diameter, 
1.5 mm. (Bartsch.) 
Type in United States National Museum, No. 213688. Type locality, 
U.S. Bureau of Fisheries, Station 2901, off Santa Rosa Island, California. 
Range. Santa Rosa and Santa Catalina Islands, California. 
Alvania iliuliukensis Bartsch, 1911 
Plate 82, fig. 2 
Proceedings of the United States National Museum, 41:350; PI. 31, fig. 2. 
Shell ovate, light purplish brown. Nuclear whorls two (surface 
eroded). Post-nuclear whorls well-rounded, appressed at the summit, 
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