CLASS GASTROPODA 
209 
formity; aperture rather wide, the outer lip arcuate thin simple; the body 
with a thin layer of callus; the pillar straight; the canal short, wide, re¬ 
curved ; operculum normal, with a glazed border on the inner side. Height 
of shell, 38; of last whorl, 26; of aperture, 19; diameter, 18 mm. (Dali.) 
Type in United States National Museum, No. 225614. Type locality, 
United States Fish Commission Station 3643, western Bering Sea. 
Range. Arctic Ocean to Bering Sea to Shumagin Islands. 
Plicifusus virens Dali, 1877 
Plate 4, fig. 8 
Proceedings of the California Academy of Sciences, 7:6. Scientific Results of the 
Exploration of Alaska; PI. 2, fig. 3, 1879. 
Shell small, similar to the last species ( C . brunneus ) in general char¬ 
acters, but covered with a grass-green epidermis, tinged with livid brown 
in some specimens. The canal is more clearly defined, the aperture much 
shorter and rounder, the ridges and grooves less prominent and clearly 
defined. The costae are more arcuated posteriorly, and the embryonic 
whorl larger, with revolving threads, instead of being smooth. Whorls 
five and a half. Costae, nine to eleven on the last whorl; ridges more 
numerous than in the last species, but almost too faint to count. Length, 
.65; width, .34; canal and aperture, .37; spire, .3; width of aperture, .17; 
length without the canal, .18 in. (Dali.) 
Type in United States National Museum. Type locality, Kyska Har¬ 
bor, in 10 fathoms. 
Range. Bering Sea to Middleton Island, Alaska. 
This was described as a Clirysodomus. 
Plicifusus oceanodromae Dali, 1919 
Plate 9, fig. 3 
Proceedings of the United States National Museum, 56:314. 
Shell of moderate size, bucciniform, acute, white, of about seven 
whorls, moderately rounded, the suture, not appressed; axial sculpture of 
(on the last whorl, about 22) narrow, rounded, retractively arcuate ribs, 
with subequal interspaces, extending from the suture to the base; incre¬ 
mental lines not prominent; spiral sculpture of close-set flattish threads of 
somewhat irregular strength, often medially grooved, and having a ten¬ 
dency to associate in groups of two or three, these cover the whole surface; 
aperture buccinoid, retractively conspicuously waved near the suture, pro¬ 
tectively arcuate beyond; throat white, body with a glaze, pillar slightly 
arcuate, canal wide recurved; operculum with apical nucleus. Height of 
shell, 34; of last whorl, 25; of aperture, 17; diam., 16 mm. (Dali.) 
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