288 CALIFORNIA ACADEMY OF SCIENCES. 



Family LXVI. CYPK.EIDiE. 

 Genus Cypraea Linne. 



Shell ventricose, convolute, covered with shiny enamel; spire concealed; aperture long and 

 narrow, with a short canal at each end; inner lip crenulated; outer lip inflected and crenulated. 



Cyprcm argus Linn, is a characteristic species. 



309. Cypraea spadicea Gray. 



CyprcBa spadicea Swainson, Tillock's Phil. Mag., Vol. LXI, 1823, p. 376; E.xotic Conchology, 



PI. CLXXXII. Tryon, Man. Conch., Vol. VII, p. 182, PI. XIII, fig. 78, 1885. 

 Cyprcea spadicea Gray, Monog. Cyprseidea, Zool. Jour., London, Vol. I, 1824, p. 71. Dall, 



Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 207. 

 Luponia spadicea Gray, Cpr., Brit. Assn. Rept., 1863, p. 657. Keep, West Coast Shells, p. 59, 



fig. 43, 1892. 

 Lupoiiia spadicea SwAiN., Gabb, Pal. Cal., Vol. II, p. 78, 1869. Cooper, 7th Ann. Rept. Cal. St. 



Min., 1888, p. 247. 



Shell of medium size, pyriform, ventricose, convolute; spire concealed; surface covered 

 with shining reddish brown enamel in hving shell (in the fossil obtained at San Pedro this is worn 

 and subdued); aperture long and narrow, with a short canal at each end, the anterior canal being the 

 longer; outer lip inflected and crenulated; inner lip crenulated. 



Dimensions. — Long. 50 mm.; lat. 33 mm.; altitude, when lying aperture down, 25 mm. 



Specimen identified by Dr. Dall. 



One specimen from the upper San Pedro series of Deadmuii Island found by 

 Mrs. Oldroyd, and one from the upper San Pedro series at the lumber yard, San 

 Pedro, found by Delos Arnold. 



Living. — Santa Barbara to San Diego and Lower California (Cooper). 



Pleistocene. — Santa Barbara Island (Cooper) : San Pedro (Oldroyd; Arnold). 



Genus Trivia Gray. 



Small shells with strict extending over the back, where they are frequently interrupted by an 

 impressed dorsal sulcus. 



Trivia quadripunctata Gray is a characteristic species. 



310. Trivia californica Gray. 



Trivia cali/ornicaGrAy, CvR., Brit. Assn. Rept., 1863, p. 657. Keep, West Coast Shells, p. 60, 

 figs. 44, a, b, 1892. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 207. 



Shell small, semiglobular; conve.x surface crossed by eight or nine transverse ridges, which 

 are interrupted on the center of the shell by a slight depression running longitudinally; sloping 

 surface of ends ornamented with several ridges that radiate from the ends of the dorsal depression; 

 aperture narrow, curved; outer and inner lip denticulated by elongated, sharp teeth, the continua- 

 tions of the transverse ridges. 



Dimensions. — Long. 8 mm.; lat. 6.5 mm.; alt. 5 mm. 



