THE SMALLER SEA-SHELLS 191 
Murex trialatus, Sby., the Three-Winged Murex, 
is a much smaller shell, with dark brown and 
white color bands. The shoulder of the whorls is 
excavated, the three varices thick and rounded, and 
the frills sometimes beautifully recurved. <A fine 
specimen was dredged by Mr. H. N. Lowe, off San 
Pedro, in 10 fathoms of water. 
Murex circumtéxtus, Stearns, the 
Cireled Murex, Figure 196, (Ocinebra 
circumtexta), has a rather heavy 
shell, many low varices, very deep and 
distinet spiral grooves which give the 
outer lip a sealloped appearance. It 
is of a reddish color within, but ex- 
ternally it is whitish, with brown spots arranged 
ina spiral. 
Fig. 196 
Murex festivus, Hds., the Fes- 
tive Murex, (Pteronotus festi- 
vus), is shown in Figure 197. I 
have gathered fine specimens of 
this grand species at San Pedro, 
when the tide was low, by going 
among the piles of the wharves 
to which these and other species 
of mollusks were clinging. The 
shell is plainly marked by three 
reflexed frills on each whorl, al- 
ternating with rounded knobs. 
In perfect specimens there are 
numerous fine spiral lines of sculpturing, which 
are often covered with foreign substances. The 
canal is completely closed, forming a tube, which 
is reflexed near its extremity. The color is white 
Fig. 197 
