20 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
narrow; columella slightly twisted, widened; umbilicus subperforate. 
(Arnold.) 
Type in British Museum? Type locality, San Diego, California. 
Range. Santa Barbara, California, to Magdalena Bay, Lower Cali¬ 
fornia. Fossil: Pleistocene—Ventura, San Pedro, San Diego, California. 
Tritonalia painei Dali, 1903 
Plate 32, fig. 7 
Proceedings of the Biological Society of Washington, 16:174. 
Shell small, rotund, whitish, with five or six whorls; nucleus small, 
smooth, polished; subsequent whorls strongly sculptured; axial sculpture 
of numerous (on the penultimate whorl, 15) sharp, longitudinally wrinkled 
varices extending from the suture to the canal with wider interspaces and 
somewhat angular or spinose at the shoulder of the whorl; these varices 
are usually confluent at the suture with those of the preceding and follow¬ 
ing whorl; spiral sculpture of strong elevated rounded threads, with a 
smaller thread in the interspaces, somewhat crenulating but not overriding 
the varices; aperture ovate, the peristome thin, simple, continuous, pro¬ 
jecting , there are no lirations in the aperture, the siphonal fasciole is well 
marked, the canal short and closed over in front of the aperture, with no 
discarded cana-spines. Length, 15; length of last whorl, 11; maximum 
diameter, 8 mm. (Dali.) 
Type m United States National Museum, No. 109306. Type locality, 
off Catalina Island, California. 
Range. Dundas Bay, Alaska, to San Diego, California. 
Tritonalia circumtexta Stearns, 1871 
American Journal of Conchology, 7; PI. 14, 
Conchological Memoranda , Part VI: 1. 
fig. 14. 
Shell ovate, solid, sub-turreted, of five convex whorls. Upper whorls 
cancellated; body whorl transversed by about 14 roughly-rounded revolv¬ 
ing costae, more or less tuberculated at the intersection of the longitudinal 
.. at ' mar ed with fine incremental striae. Last whorl, three-fourths 
e length of the shell; outer lip thickened, internally denticulate, external 
g , d ‘ Columella excavated, light purple or purplish-brown; 
canal short, open or closed in specimens of equal size. Umbilicus obsolete; 
rface of whorls with faint irregular longitudinal costae. Color dingy 
'5 in 6 ’ (Stearns' 3 ) mterrUPted ^ dark " brown bands - Long., -85; lat., 
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