334 University of California Publications in Zoology — [Vou. 14 
Description.—Tryon (1882) described this eastern species as follows: 
‘*Chocolate-brown or olive, with occasionally a faint, lighter colored central 
band; deep chocolate within the aperture, with a central white band.’’ 
Height, 7 to 23 mm. 
Occurrence—At stations D 5811 (4), D 5814 (7), near Key Route 
Pier*, Oakland (36). : 
This eastern species, probably introduced with ‘‘seed’’ oysters, was 
first found upon the oyster beds near Alameda in the year 1909 by 
Keep (1911). It was obtained by the Survey at two localities in the 
vicinity of Point San Pedro and near the Key Route Pier, Oakland. 
At the more southern locality it was associated with the oysters, upon 
which it undoubtedly preys. It occurs at a depth of 1 fathom on a 
mud-shelly bottom. 
Range.—San Francisco, California. 
MURICIDAE 
Murex Linnaeus 
Murex carpenteri (Dall) 
Pteronotus carpenteri Dall (1899d), p. 138. 
Murex carpenteri, Oreutt (1915), p. 93. 
Description.—Dall originally described this species as follows: 
“*Shell trilate, reddish brown, with obscure spiral lines of darker brown, 
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 reticulate threading; 
the last two or three whorls with a single obscure nodulosity on the periphery 
between the varices; varices continuous up the spire; posterior face of the 
varices smooth with obseure 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 faces of the varices with a profuse, close-set crenulate imbrication, 
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; aperture 
small, oval, with a continuous, raised, smooth margin with denticulations; 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.’’ 
This species, according to Oreutt (1915), oceurs at the Farallon 
Islands. 
Range.—Farallon Islands to San Diego, California (Orcutt). 
