CLASS GASTROPODA 
73 
those on the posterior half of the base are usually stronger than the rest. 
In addition to the spiral sculpture, the whorls are marked at irregular 
intervals by strong, oblique varices. Suture strongly constricted. Periphery 
of the last whorl inflated, well-rounded. Base moderately long, well- 
rounded, and inflated, its posterior half marked like the anterior half 
between the sutures, bearing the feeble extensions of the varices. Aperture 
very large, broadly oval; posterior angle obtuse; outer lip thin and trans¬ 
parent; columella very oblique and somewhat curved, slightly reflected 
over the re-enforcing base; parietal wall glazed with a thin callus. Length, 
5; diameter, 2.1 mm. (Bartsch.) 
Type in United States National Museum, No. 182565. Type locality, 
Margarita Bay, Lower California. 
Range. San Pedro, California, to Gulf of California. 
Alaba catalinensis Bartsch, 1920 
Journal of the Washington Academy of Sciences, 10:1920. 
Shell elongate-conic, milk white, early whorls well-rounded, the suc¬ 
ceeding turns a little less so. All whorls polished, appressed at the summit, 
and marked by fine, retractively slanting lines of growth. Beginning with 
the second turn, vertical thickenings make their appearance; these are very 
feeble on the early whorls, but increase steadily in strength until on the 
last turn they form decidedly raised sinuous ridges. The last whorl, too, 
shows well-marked malleations. Aperture oval; posterior angle obtuse; 
inner lip curved and reflected, but not appressed to the base; parietal wall 
covered by a thick callus. Length, 5.3; diameter, 1.9 mm. (Bartsch.) 
Type in United States National Museum, No. 213369. Type locality, 
off Catalina Island, in 40 fathoms. 
Range. Known only from type locality. 
Family ? 
Genus BARLEEIA Clark, 1855 
The color is plain red-brown; smooth or slightly wrinkled; of 4 ]/ 2 to 
Sy 2 tumid volutions, which form a rapidly increasing cone. Aperture oval, 
entire, contracted above, rounded basally; outer margin sharp, without the 
callous pad of the Rissoa . Axis one-tenth; diameter, one-seventeenth of 
an inch. (Clark.) 
Type. Barleeia rubra Adams. 
Distribution. West coast of America to Mazatlan. 
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