IGO CALIFORNIA ACADKMY DF SCIENCES. 



Ivari' ill iippor S.iii I'l'.lio scries of San IV-dm; oiio pcifccl rii;lil valve, wliiuii 

 is figureil, is now in tlie collei'tiun of Delos Arnolii. 



Liriiig. — Panaiua; ('ciilrai America (Carpenter). 

 Pkislocene. — San IVmIid ( A iimlil ). 



Genus Metis //. .(, A. Adains. 



Shell slij>Inly incqiiivalvc. suborbicular, compressed; valve sillonated; posterior flcxuosity 

 submedian; no lateral teeth. 



Tellina meyeri Pliil. is a characteristic species. 



103. Metis alta Climnid. 



Tellina alia CoN., Jour. Phil. Acad. Nat. Sci., \'ol. VII, 1.S37, p. 258; (not T. alta Con., Foss. Tert. 



Form., Vol. I, No. 4, p. 41, 1833. Hanley, Thes. Conch., Vol. I, p. 332, PI. LXII, 



fig. 200, 1847. 

 LtUricola alta Con., Carpenter, Brit. A.s.sn. Rept., 1S63, p. 639; ^^Arcopagia mcdialis Con. (yfidc 



CJAUB, Pal. Cal., Vol. II, p. 92, 1869). Cooper, 7th Ann. Rept. Cal. St. Min., 1888, 



p. 247. Keep, West Coast Shells, p. 197, 1892. Williamson, Proc. U.S. Nat. Mus., 



Vol. XV, 1892, p. 186. 

 Metis alta Coti., ^= Scrobiculat ia biangulata Ci'R. {Jide Dall, Trans. Wagner Inst. Sci., Vol. HI, 



Part 5, 1900, p. 1044). 



Shell large, suboval, approaching to subcircular, ventricose, of medium thickness; beaks 

 central; anterior extremity obtusely rounded ; posterior side of the deeper valve biangulated; the 

 opposite valve with an angular groove; surface sculptured by numerous prominent lines of growth 

 and by numerous minute, radiating lines; cartilage-pit more vertical than oblique; muscle- 

 impressions large. 



Dimerisious. —hon^. 75 mm.; alt. 65 mm.; diam. 40 mm. 



Resembles a large, roiiiuled, ventricose Macoma. Specimens identified by 

 Dr. Dall. 



Common in upper San Pedro series of San Pedro, and exceedingly so in the 

 Pleistocene of Los Ccrrito.s, where they occur in beautifully preserved pairs. A few 

 specimens found in the upper San Pedro series at Deadinan Island and Crawlish 

 George's; ami in tlie lower San Pedro series at Deadnian Island. I'^oiind in the 

 Pliocene at Pacific Beach, and in the Plei.stocene at Spanish Bight, San Diego. 



Living. — Santa Barbara to San Diego (Cooper). 



Pleistocene. — San Pedro (Cooper; Arnold): San Diego (Arnold). 



Pliocene. — Santa Barbara (Cooper): San Fernando (Cooper; Arnold): San 

 Diego (Arnold). 



Miocene. — Monterey; El Toro Ranch, IMonleroy County (Cooper). 



Gemi.s Macoma Leach. 



Shell without lateral teeth, usually subtrigonal and with a marked posterior fle.xure; the 

 surface feebly sculptured concentrically, or smooth; the siphons naked. 



Type, 31. tenera Leach. 



