CLASS GASTROPODA 
77 
covered by a thick callus, which renders the peritreme complete; oper¬ 
culum typical. Altitude 1.3; diameter, 9 mm. (Bartsch.) 
Type in United States National Museum, No. 226453. Type locality, 
off Coronado Islands, northwest coast of Lower California. 
Range. San Pedro, California, to Point Abreojos, Lower California. 
Barleeia oldroydi Bartsch, 1920 
Proceedings of the United States National Museum, 58:171; PI. 13, fig. 9. 
Shell narrowly conic, light chestnut brown. Nuclear whorls one and 
three-fourths, well-rounded, marked by slightly retractively slanting rows 
of exceedingly minute pits, which appear to be ranged also in spiral series. 
Post-nuclear whorls almost flat, appressed at the summit, marked by fine 
incremental lines and exceedingly fine, closely spaced, spiral striations. 
Suture only slightly constricted. Periphery of the last whorl obsoletely 
angulated. Base moderately long, moderately rounded. Aperture moder¬ 
ately large, oval; posterior angle obtuse; outer lip thin; the curved inner 
lip joins the basal lip in a curve; inner lip appresses to the base for a 
little more than half its length, the extreme anterior portion only being 
free; parietal wall covered by a thick callus, which renders the peritreme 
complete. The summit of the last turn falls slightly below the peripheral 
angle at the aperture; operculum typical. Altitude, 3.3; diameter, 1.5 mm. 
(Bartsch.) 
Type in United States National Museum, No. 32376. Type locality, 
Monterey Bay, California. 
Range. Mink Bay, Vancouver Island, to Coronado Islands. 
Genus DIALA A. Adams, 1861 
Whorls not varicose, sometimes nodulated around the middle; colu¬ 
mella straightish, not truncated; labrum not thickened. (Tryon, Struc¬ 
tural and Systematic Conchology.) 
Type. Alaba varia A. Adams. 
Distribution. Philippines, Japan, west coast of North America. 
Diala exilis Tryon, 1866 
American Journal of Conchology, 2:12; PI. 2, fig. 18. 
Shell subulate, light brown, consisting of six convex volutions, with 
well-marked suture; aperture oval, proportionately very small; surface 
covered with slight revolving striae. Length, .135; diameter, .07; length 
of aperture, .04; breadth, .03 in. (Tryon.) 
Type in Tryon’s Cabinet. Type locality, San Diego, California. 
Range. San Francisco Bay to San Diego, California. 
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