82 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
% 
inner lip, the peristome continuous. Height, 0.75; diameter, 0.60 mm. 
(Dali.) 
Type in United States National Museum, No. 105466. Type locality, 
San Diego, California. 
Range. Known only from type locality. 
Subgenus Nodulus Monterosato, 1878 
Cingula cerinella Dali, 1886 
Proceedings of the United States National Museum, 9:307; PI. 4, fig. 12. Ibid,, 41:289; 
fig. 1. 
Shell small, thin, light yellow. The nucleus consists of a single turn, 
which is smooth and scarcely differentiated from the succeeding whorls. 
Post-nuclear whorls high between the sutures, moderately rounded, ap- 
pressed at the summit, marked by fine incremental lines only. Suture well 
constricted. Periphery of the last whorl and the rather long base gently 
rounded. Aperture very oblique, large, broadly oval; posterior angle 
obtuse; outer lip thin; columella very oblique, slightly curved, inner lip 
partly reflected over the base; parietal wall covered with a thick callus, 
which is free at the edge and renders the peritreme complete. Length, 
2.9; diameter, 1.3 mm. (Dali.) 
Type in United States National Museum, No. 213453. Type locality, 
Atka Island, Alaska. 
Range. Kyska and Amchitka and Atka Islands, Alaska. 
Described as Onoba cerinella in 1886. 
Cingula asser Bartsch, 1919 
Nautilus, 23:138; PI. 11, fig. 9. 
Shell elongate-conic, bluish white, semitranslucent. Nuclear whorls 
one and one-tenth, smooth, a little less elevated than the succeeding turns. 
Post-nuclear whorls very high between the sutures, overhanging, moder¬ 
ately rounded, appressed at the summit. The preceding whorl shines 
through the summit of the succeeding turn and gives this the appearance 
of having a double suture. Sutures well-impressed. Periphery of the 
last whorl well-rounded. Base moderately prolonged, well-rounded. En¬ 
tire surface of spire and base marked by closely placed, exceedingly fine, 
microscopic, spiral striations. Aperture very broadly ovate; posterior 
angle obtuse; outer lip thin; peritreme complete. Length, 2.2; diameter, 
0.9 mm. (Bartsch.) 
Type in United States National Museum, No. 208434. Type locality, 
Port Graham, Alaska. 
Range. Atka Island, Aleutians, to Cook’s Inlet, Alaska. 
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