64 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
striae, though plainly marked by the deeply notched lines of growth. The 
anterior surface of the carina and whorls is covered with sharp, revolving 
grooves, with wider interspaces, being about twelve on the body whorl, 
between the posterior edge of the aperture and the carina. The notch is 
deep, and about one-third of the way from the carina to the suture. 
Aperture and canal long and narrow; outer lips, before the carina, effuse. 
Nucleus white. Long., 3; lat., 1 in. (Dali.) 
Type in United States National Museum. Type locality, Nateekin Bay, 
Captain's Bay, Unalaska. 
Range. Bering Sea to Straits of Juan de Fuca. 
Genus LEUCOSYRINX Dali, 1889 
Shell moderately large, thin, white, or pale, with impervious axis, the 
sculpture chiefly of delicate spiral threading with feeble axial riblets at 
the shoulder; anal fasciole wide, shallow, next the suture; canal moder¬ 
ately long, distally flaring; the pillar thick, anteriorly obliquely truncate; 
operculum subovate, acute in front, with a medial thickened rib on the 
inner face, the area of attachment small, the nucleus apical. (Dali.) 
Type. Pleurotoma verrilli Dali. 
Leucosyrinx kincaidi Dali, 1919 
Plate 6, fig. 2 
Proceedings of the United States National Museum, 56:6; PI. 2, fig. 8. 
Shell of moderate size, fusiform, with an acute spire and elongated 
canal waxen white, nucleus of two smooth bulbous whorls with five 
subsequent whorls; axial sculpture only of faint incremental lines; spiral 
sculpture including a very prominent, thin, sharp, peripheral keel and fine 
spiral striae with wider interspaces, over most of the surface; the inter¬ 
spaces become more rounded and coarse on the base; the entire space 
between the keel and the preceding suture may be said to form the anal 
fasciole, the wide arcuate sulcus being situated a little way in front of the 
suture; the base is neatly rounded and contracted at the beginning of the 
canal; outer lip thin, sharp, much produced in front, inner lip slightly 
erased; pillar obliquely attenuated in front, gyrate, and with a minutely 
pervious axis; canal narrow, slender; operculum yellowish, ovate, with an 
apical nucleus. Height of shell, 29; of last whorl, 21.5; diameter, 13 mm. 
(Dali.) 
Type in United States National Museum, No. 151581. Type locality, 
Shelikoff Strait, north of Kodiak Island, Alaska. 
Range. Known only from type locality. 
[ 64 ] 
