CLASS GASTROPODA 
35 
ture as long as the shell, outer lip reaching to the end of the spine, from 
which it is separated by a narrow groove, laterally straight, anteriorly 
rounding to the slightly thickened pillar; body with a coat of enamel which 
extends to the pillar and the spine. Length, 4; diameter, 1.7 mm. (Dali.) 
Type in United States National Museum, No. 211303. Type locality, 
United States Fish Commission Station 2902, off Santa Rosa Island, 
California. 
Range. Santa Rosa Island to San Diego, California. 
Family SCAPHANDRIDAE 
Genus SCAPHANDER Montfort, 1810 
Shell oblong, convolute; spirally striated; aperture much expanded in 
front; spire concealed; epidermis thick; lingula teeth 1.0.1, crested. 
Type. Bulla lignaria Linnaeus. 
Distribution. United States, Norway, Britain, Mediterranean, on 
sandy ground to 50 fathoms. 
Scaphander willetti Dali, 1919 
Proceedings of the United States National Museum, 56:299. 
Shell small, yellowish-white, of about four whorls, the apex sunken but 
exposed in a pit bounded by a sharp carina, the shell wider anteriorly; 
surface with faint incremental lines crossed obliquely by minute vermicular 
sculpture, which is more nearly spiral about the middle of the shell and 
visible only under the lens; aperture narrow behind, wider and produced 
in front, the edge of the outer lip produced to form the apical carina, 
laterally straight and rounded to the pillar in front; umbilical region 
covered with a smooth layer of enamel, pillar concave, axis twisted. 
Height, 12.5; maximum diameter, 7; diameter at apex, 2 mm. (Dali.) 
Type in United States National Museum, No. 216405. Type locality, 
Forrester Island, Alaska. 
Range. Forrester Island, Alaska. 
Genus ATYS Montfort, 1810 
Shell rather solid, unicolored, with a smooth epidermis; usually spirally 
striated; spire scarcely visible; aperture longer than the inner margin at 
both ends; columella with a single, more or less obsolete plication. 
Type. Atys naucum Linnaeus. 
Distribution. In all temperate and tropical seas. 
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