28 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Eupleura grippi Dali, 1911 
Plate 32, fig. 6 
Nautilus, 25:87. 
Nucleus small, of a single whorl or slightly more, dark chestnut- 
brown in color, smooth and slightly tilted, followed by four and a half 
subsequent whorls, with the inception of which the sculpture changes 
abruptly; the first has two, the second three, the third four spiral threads 
between the periphery and the subsequent suture; the two original threads 
stronger than the others, but all becoming relatively feebler, and on the 
last whorl obsolete; the posterior slope of the whorls is smooth except for 
lines of growth; on the last whorl there are very obscure indications 
of obsolete spiral sculpture; the whorls have, in the type specimen, about 
five obscure nodes at the shoulder, reminiscent of the varices of the 
other species of the genus; whorls increasing in size rapidly, the shoulder 
slope flattish, situated at the posterior third on the last whorl, the suture 
distinct, but not appressed; aperture ovate, the body with a light glaze, 
the outer lip thickened, sharp-edged, tinged with orange color; the type 
has eight small denticles within on the callus; canal short, open, slightly 
recurved; general tint of the type specimen dark, livid, olive color; 
operculum muricoid. Height of shell, 21.5 ; of last whorl, 18.0; of aperture, 
excluding the canal, 10.0; diameter, 11.0; of aperture, 6.2 mm. (Dali.) 
Type in United States National Museum. Type locality, off San 
Diego, California. 
Range. Known only from type locality. 
Genus TROPHON Montfort, 1810 
Shell rather strong, fusiform, spire produced, whorls rough, with 
lamellar varices, their interstices often lirally sulcated; mouth produced 
below into a narrow canal; no teeth or plaits on pillar lip. Operculum 
corneous, unguicular; its nucleus terminal. The species are inhabitants 
chiefly of deepish water, and for the most part belong to Arctic and 
boreal seas. (Forbes and Hanley.) 
Type. Trophon clathratus Linnaeus. 
Distribution. Mostly cold seas; typically, Arctic and Anarctic. 
Subgenus Austrotrophon Dali, 1903 
Trophon triangulatus Carpenter, 1864 
Plate 34, figs. 6, 7 
Proceedings of the California Academy of Sciences, 3 :224. Proceedings of the United 
States National Museum, 14; PI. 5, figs. 1, 3, 6, 1891. 
. T '. t- parv f’ tenui alblda > postice lata, antice attenuata; anfr. nucl. ii. 
minutis, laevibus, attenuate, vertice declivi, celato; norm. (t. adolescente) 
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