CLASS GASTROPODA 
237 
Family CYPRAEIDAE 
Genus CYPRAEA Linnaeus, 1758 
Shell ventricose, convolute, covered with shining enamel; spire con¬ 
cealed ; aperture long and narrow, with a short canal at each end; inner 
lip crenulated. (Woodward, Manual of the Mollusca.) 
Types. Cypraea tigris Linnaeus, and Cypraea mauritiana Linnaeus. 
Distribution. In all warm seas (except east coast South America?) 
but most abundant in those of the old world, on reefs and under rocks at 
low water. 
Cypraea spadicea Swainson, 1823 
Philosophical Magazine, 61:376. Tryon, Manual of Conchology, 7: PI. 22, figs. 13, 14. 
C. testa ovata, oblonga, immaculata; dorso rufo; ventre albo; lateribus 
lividus. 
Shell ovate-oblong, unspotted; the back reddish chestnut; belly white; 
sides livid. (Swainson.) 
Type in Museum Dubois. Type locality, California. 
Range. Santa Barbara to San Diego, California. Ecuador? 
Family TRIVIIDAE 
Genus TRIVIA Gray, 1832 
Small shells with striae extending over the back, where they are fre¬ 
quently interrupted by an impressed dorsal sulcus. (Tryon, Structural 
and Systematic Conchology.) 
Type. Trivia europaea Montague. 
Distribution. Greenland, Britain, West Indies, Cape, Australia, 
Pacific, Western America. 
Trivia radians Lamarck, 1810 
Paris Musee d’histoire naturelle, Amtales, 15: 102. Tryon, Manual of Conchology, 7: 
PI. 22, figs. 13, 14. 
Shell suborbiculata, pallide rubella; lateribus dilatatis depressis; striis 
transversis subradiatis; sulco dorsali; ventre piano, striato. (Lamarck.) 
Rotundly ovate, sides dilated, dorsal impression broad, nodose on each 
side, the ribs diverging from the nodules, back stained with a dark blotch, 
base depressed. (Tryon, Manual of Conchology.) 
Type locality, Gulf of California. Type in Lamarck Cabinet. 
Range. Lower California, Gulf of California to Ecuador. 
Described as Cypraea. 
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