178 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
shell; apex of the spire bluntly rounded. Length, 1.2; breadth, .5 in. 
(Trask.) 
Type in ? Type locality, San Pedro, California. 
Range. Banks Island, British Columbia, to Pequena Bay, Lower Cali¬ 
fornia. Fossil: Pleistocene, Santa Barbara, San Pedro, California. 
Described from a fossil. 
Fusinus kobelti Dali, 1877 
Proceedings of the California Academy of Sciences, 7:54. Proceedings of the 
United States National Museum, 14:177; PI. 6, fig. 4. 
Shell elegantly and regularly fusiform, of seven or eight whorls, sculp¬ 
tured with revolving lines and transverse costae. In young specimens the 
whorls are somewhat rounded, in the adult elongated. Epidermis in 
perfect specimens dark ashy or greenish olivaceous, rising in crowded 
lamellae and obscuring the coloration. This varies, however, with age 
and habitat. Apex acute, the second and third whorls hardly larger than 
the embryo. Color whitish, the alternate revolving ridges of a dark 
brown, which occasionally extends to all the ridges. These ridges do not 
lose their color in passing over the costae, except where worn off by roll¬ 
ing on the beach. Except on the earlier whorls the ridges do not show 
any tendency to enlarge in passing over the costae. On the posterior 
edge of the whorls the shell is appressed on the suture, and the ridges 
here are inconspicuous in most specimens, compared with those on the 
body of the whorl. These ridges, moreover, bear the character of threads, 
the interspaces not being channeled, as in F. harfordi and luteopictus. 
In the most perfect specimens, on the last whorl there are twenty-two 
brown ridges and as many more intercalary, of the same color as the 
shell. In melanitic specimens all may be tinged brown. On the ante¬ 
penultimate whorl between the sutures there are about six main ridges and 
eight intercalary. The costae are rounded and prominent only on the 
earlier whorls, but they remain on the last whorl in a flattened condition, 
but extend well over the periphery, and are not obsolescent as in the last 
species. The interior of the aperture is white. Before the lips are 
thickened the brown lines show through, and the prominent white threads 
of the throat are distant from the outer edge. In this stage there is no 
siphonal fasciole. Later both lips may be strongly thickened; the threads 
(ten or fifteen in number) nearly reach the edge; a labial callus and fas¬ 
ciole are formed. In adults there are about twelve costae on the last and 
ten on the sixth whorl. Length, 2 to 3 in. (Dali.) 
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