66 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Type in United States National Museum, No. 123101. Type locality, 
U.S.S. “Albatross” Station 3393, Gulf of Panama, in 1,020 fathoms. 
Range. Abyssal, eastern Pacific. 
Leucosyrinx persimilis blanca Dali, 1919 
Proceedings of the United States National Museum, 56:5. 
Shell dififering from the original persimilis by the well-marked spiral 
sculpture being continuous over the whole surface and by the pronounced 
depressed spiral area on each side of the convex anal fasciole, which with 
the ridge at the shoulder gives the effect of two parallel ridges behind the 
periphery. Height of shell, 60; of last whorl, 44; diameter, 22 mm. 
(Dali.) 
Type in United States National Museum, No. 214337. Type locality, 
off Cape Blanco, Oregon, in 1,064 fathoms. 
Range. Known only from the type locality. 
Leucosyrinx persimilis leonis Dali, 1908 
Bulletin, Museum of Comparative Zoology, 43:272. 
Shell small compared with the typical species, white, of about seven 
evenly rounded whorls. Compared with young of L. persimilis of the 
same size the whorls are more capacious, smoother, not flattened behind 
nor on the periphery; the carinations of persimilis are wanting or ex¬ 
pressed only by an obsolete indication of a ridge; the canal is wider and 
more recurved, the anal fasciole shows the markings of the sulcus to be 
wider and not quite so near the suture. Long, of shell, 50; of last whorl, 
38; of aperture, 29; maximum diameter, 18 mm. (Dali.) 
Type in United States National Museum, No. 110605. Type locality, 
U.S.S. “Albatross” Station, off Sea Lion Rock, coast of Washington. 
Range. Off Sea Lion Rock, Washington, to Cortez Bank, California, 
in deep water. 
Genus IRENOSYRINX Dali, 1886 
Shell large, thin, fusiform, white, with a keel at the shoulder; sculpture 
feeble, wholly spiral; anal sulcus wide, shallow, nearer the shoulder than 
the suture; axis pervious, aperture and canal longer than the spire; outer 
lip produced, thin, simple; canal elongate, pillar obliquely truncate; 
operculum in the young paucispiral, later the paucispiral nucleus is sur¬ 
rounded by concentric additions, leaving the nucleus subcentral, or a 
[ 66 ] 
