190 WEST AMERICAN SHELLS 
We begin our deserip- 
tions with a rare species 
Murex carpentert, Dall, 
Carpenter’s Murex, Fig- 
ure 194. The picture is 
of about the natural size, 
and clearly shows the 
main features of the shell. 
The aperture is small, 
oval, and has an elevated 
rim without denticula- 
tions. The color is red- 
dish brown. There are 
Fig. 194 (*) 
three wing-like varices on each whorl, and be- 
tween them the shell is nearly smooth. This spe- 
cies has been found at Monterey, and has been 
dredged in various places southward from the 
Farallone Islands. 
Fig. 195 (*) 
The mueh _ befrizzled 
shell shown in Figure 195 
is another of the three- 
winged California forms, 
and is named Murex petri, 
Dall, Peter’s Murex. It 
was obtained by Mr. and 
Mrs. Oldroyd from rather 
deep water at San Pe- 
dro, so it doubtless takes 
its name from that of the 
locality where it was ob- 
tained. The color of the 
shell is purplish-brown, 
mottled with lighter spots. 
Its length is 65 millimeters. 
