CLASS GASTROPODA 
11 
the aperture whitish with a darker throat; nucleus brownish, whorls about 
eight, the last much the largest; suture distinct, appressed, intervarical 
surface smooth or obscurely spirally striate, the apical whorls with recticu- 
late threading; the last two or three whorls with a single obscure nodu- 
losity on the periphery between the varices; varices continuous up the 
spire; posterior face of the varices smooth with obscure radial ridges 
which slightly crenulate the margin, in adolescent shells; but in full- 
grown ones there are about five rather wide, low radial ridges, each of 
which terminates in a digitation of the margin; anterior face of the 
varices with profuse, close-set, crenulate imbrications, which in fully 
grown shells show radial depressions corresponding to the ridges on the 
back of the varix; digitations excavated in a shallow manner anteriorly, 
terminating in somewhat blunt projections, thin and sharp-edged; aper¬ 
ture small, oval, with a continuous, raised, smooth margin without den- 
ticulations; canal closed, moderately wide, bent to the right in front, a 
disused smaller canal bordering its posterior two-thirds on the left. Length 
of shell, 57; of last whorl from the suture, 42; width, including varices, 
35; width of aperture, 9.5; length of aperture, 13 mm. (Dali.) 
Type in United States National Museum. Type locality, Monterey, 
California. 
Range. Point Conception to San Diego, California. 
Murex carpenteri tremperi Hemphill, 1911 
Transactions of the San Diego Society of Natural History, 1:99; PI. 1, figs. 1, la. 
Shell similar to M. carpenteri , about typical in form and coloring, 
with the addition of three white revolving bands, that expand, in width 
as they pass toward the outer edge of the foliated varices, and show on 
three of the spire whorls. There are three broad, thin varices on the 
specimen before me, the edge of the last broken by five, rather broad, 
circular indentations, separated by four, broad, rather short, chisel-shaped 
digitations, curved upward at the ends. The somewhat large basal inden¬ 
tation forms about two-thirds of a regular circle, is one-fourth of an inch 
across, its edge thickened and regularly reflexed, except next to the long, 
curved, and well-covered canal. The body and varices are quite smooth, ex¬ 
cept the last varix, which is roughened on the lower side by wavy, file-like 
striae. (Hemphill.) 
Type in Tremper Collection, Los Angeles. Type locality, off Newport, 
California. 
Range. Newport Bay and San Pedro, California, in 35 fathoms. 
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