78 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Diala acuta Carpenter, 1864 
Supplementary Report, British Association for the Advancement of Science, 657. Pro¬ 
ceedings of the California Academy of Sciences, 3 :218. 
D.t. parva, turrito-conica, cerina, polita, nitente; anfr. nucl. ii. nati- 
coideis, vertice mamillato, apice indistincto; norm, v., omnino planatis, 
suturis indistinctis; peripheria acute angulata, vix carinata; basi omnino 
planata; apertura subquadrata; peritremati continuo; labro postice paullum 
contracto ; labio appresso ; columella antice angulata, vix sinuata. Long., 
0.15 ; long, spir., 0.09 ; lat., 0.07. (Carpenter.) 
Shell small, turreted-conical, waxy, polished shining; with two naticoid 
whorls, and mamillate vertex, with indistinct apex ; normally five, all flat¬ 
tened, with indistinct sutures; periphery acutely angulate, scarcely cari¬ 
nate; basis altogether flattened; aperture subquadrate; with continuous 
border, outer lip slightly contracted in the rear; inner lip appressed ; colu¬ 
mella angulate in front, scarcely sinuate. (Translation.) 
Type in State Collection, No. 390. Type locality, Catalina Island. 
Range. Monterey, California, to Coronado Islands. 
Diala marmorea Carpenter, 1864 
Supplementary Report, British Association for the Advancement of Science, 657. Pro¬ 
ceedings of the California Academy of Sciences, 3:218. Tryon, Manual of 
Conchology, 9: PI. 53, fig. 87. 
D.t. solida, exacte conica laevia, nitente; subdiaphane pallida, rufo 
maculata; anfr. nucl. rotundatis, planorbeis, sub-oblique sitis, apice celato; 
norm. vi. planatis, suturis indistinctis ; basi planata, subangulata; apertura 
ovali, peritremati continuo, haud varicoso. (Carpenter.) 
Solid, glossy, whitish, with faint chestnut longitudinal striations; 
whorls flattened, periphery faintly angulated. Length, 5 mm. (Tryon.) 
Type in Rowell Collection, University of California. Type locality, 
Monterey, California. 
Range. Queen Charlotte Islands, British Columbia, to San Pedro, 
California. 
Family RISSOIDAE 
Genus CINGULA Fleming, 1828 
Shell minute, white or horny; conical, pointed, many-whorled; smooth, 
or cancellated; aperture rounded; peristome entire, continuous; outer 
lip slightly expanded and thickened; operculum sub-spiral. (Woodward, 
Manual of the Mollusca.) 
Type. Rissoa cingillus Montfort. 
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