CLASS GASTROPODA 
243 
nent cancellation. Its varices also, though not very prominent, are more so 
than in either of the species just mentioned. (Redfield.) 
Described as Triton. 
Genus CYMATIUM Bolten, 1798 (Triton) 
Whorls triangular; aperture longer than the spire; outer lip dentated 
internally. Operculum with apical nucleus. (Tryon, Manual of Con- 
chology.) 
Type. Triton tigrinus Broderip. 
Distribution. West Indies, Red Sea, Indian Ocean, Philippines, Cen¬ 
tral Polynesia, Madagascar, west coast Central America, Japan, Cali¬ 
fornia. 
Cymatium corrugatum tremperi Dali, 1907 
Nautilus, 21:85. 
Shell agreeing closely with C. corrugatum except in the following 
particulars: the periostracum in the latter is light-colored, velvety, with 
the processes or hairs of a uniformly even length ; in tremperi it is blackish- 
brown, coarse, lamellose, with, on the varices, strong, sparse, projecting 
hairs reaching 6 millimeters in length. In all specimens I have examined of 
the Mediterranean shell, there are, between the revolving primary ribs, 
numerous small subequal minor threads; while in tremperi there are in the 
channels only one or two coarse, irregular, markedly larger ribs. The other 
differences are all apparently of an individual character. Length, 85; 
aperture, including the canal, 36; max. diameter, 38 mm. (Dali.) 
Type in United States National Museum. Type locality, off San Pedro, 
California. 
Range. San Pedro, California, to Gulf of California. 
Cymatium gibbosum Broderip, 1833 
Proceedings, Zoological Society of London, 7. Reeve, Conchologia Iconica, (Triton), 
PI. 13, fig. 38. 
Trit. sub-fusiformi, subfulva vel subfusca, subnodulosa, transversim 
creberrime lineata; anfractibus subtrigonis; apertura subrotunda, alba, 
labri expansi radiati margine interna dentato. Long., 1; lat., 11/12 poll. 
(Broderip.) 
Shell somewhat triangularly fusiform, with four varices; spire elon- 
gately turreted, sutures deep, irregular; whorls triangularly gibbous, 
encircled with very close, raised striae, obsoletely ridged, ridges faintly 
noduled or warty ; brown or yellowish brown; canal rather short; aperture 
small, round, interior white; lip radiately flatly expanded, denticulated 
within. (Reeve, Conchologia Iconica.) 
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