CLASS GASTROPODA 
217 
wide, the outer lip thickened and slightly crenulated by the external sculp¬ 
ture, body erased; pillar short, attenuated in front; canal short, wide, 
slightly recurved. Height of shell, 26; of last whorl, 18; of aperture, 12; 
diameter, 13 mm. (Dali.) 
Type in United States National Museum, No. 106864. Type locality, 
United States Fish Commission Station 2853, near Shumagin Islands, 
Alaska. 
Range. Known only from type locality. 
Colus capponius Dali, 1919 
Plate 9, fig. 2 
Proceedings of the United States National Museum, 56 :317. 
Shell of moderate size, the spire longer than the aperture, white, with 
a thin, polished, olivaceous periostracum, and more than five whorls (the 
apex defective); whorls moderately rounded, suture distinct, deep; axial 
sculpture of fine silky incremental lines, sometimes with a tendency to 
cause wrinkles near the suture; spiral sculpture of (on the penultimate 
whorl, about 17) regular, narrow, rather deep grooves, with much wider 
flattish interspaces, uniformly covering the whole surface of the shell; 
aperture about twice as long as wide, outer lip retractively arcuate behind 
and protractively anteriorly, not reflected; pillar lip with a thin glaze, 
pillar white; canal short, wide, hardly reflected. Height of shell, 40; 
of last whorl, 27; of aperture, 18; diameter, 18 mm. (Dali.) 
Type in United States National Museum, No. 108980. Type locality, 
Bering Strait, near Port Clarence. 
Range. Known only from type locality. 
Colus acosmius Dali, 1891 
Plate 15, fig. 3 
Proceedings of the United States National Museum, 14:188; 17; PI. 27, fig. 3, 1894. 
Shell elongated, with six or seven whorls covered with a dull greenish 
epidermis and spirally sulcate with rather distant, narrow, shallow grooves, 
eighteen to twenty on the penultimate whorl; suture distinct, whorls 
flattened, canal very short and recurved; aperture white, without callus, 
lip hardly reflected. Length of shell, 60; of aperture, 25; breadth, 23 mm. 
(Dali.) 
Type in United States National Museum. Type locality, U.S.S. “Alba¬ 
tross” Station 3329, of? Unalaska Islands, Bering Sea. 
Range. Off Pribilof Islands, Bering Sea to Unalaska. 
[217] 
