288 CALIFOKNIA AlADliMV OF SlIENCES. 



Family LX\ I. CYPR.EID/E. 

 Genus Cypraea Llmu. 



Slic'll vcntricosc, convolute, covered will) siiiny enamel; spire concealed; aperture lonj^ and 

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



Cypnea argus Linn, is a characteristic species. 



309. Cypraea spadicea Gray. 



Cypraa spadicea Swainson, Tillock's Phil. Mag., Vol. I. XI, iS.>3, p. 376; Kxotic Conchology, 



PI. CLXXXII. Tkyon, Man. Conch., Vol. VII, p. 182, Pi. XIII, tig. 78, 1885. 

 Cypriea spadicea Gray, Monog. Cypra-itiea, Zool. Jour., London, Vol. I, 1S24, p. 71. Dali., 



Proc. U. S. Nat. Mus., Vol. XV, 1S92, p. 207. 

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



fig. 43, 1892. 

 Luponia spadicea Swain., Gabh, Pal. Cal, Vol. II, p. 78, 1869. Cooper, 7ih Ann. Rcpt. Cal. St. 



Min. , 18S8, p. 247. 



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

 with shining reddish brown enamel in living 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 Deadman Island found by 

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

 Pedro, found by ])elos Arnold. 



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



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



Genus Trivia Gray. 



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

 impressed dorsal sulcus. 



Trivia quadripunciaia Gray is a characteristic species. 



310. Trivia californica Gray. 



Trivia ca/i/ornica Gray, Cpr., Brit. Assn. Rcpt. , 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; convex 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. 



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



