CA MB HI A X FA UNA S O F ( 'HIXA —WAL C '0 TT. 9 9 



OSTRACODA. 



Genus BRADORIA Matthe\?v. 

 BRADORIA BERGERONI, new species. 



General outline f)r()adly seniielliptical. Hinge line straioht, nearly 

 as witle as the bi'eadth of the \'alve: anterior cardinal angle al)Out '6*')'\ 

 jjosterior cardinal angle .slightly obtuse; the auterior margin is very 

 slightly curved from the angle to where it merges into the broadly 

 rounded front; posterior margin somewhat broadh' rounded from the 

 angle to the front. Surface convex, the greatest convexity being back 

 of the transverse center between the ocular tubercle and the posterior 

 fourth of the valve. From this elevated portion the surface slopes 

 rapidly and somewhat abruptly to the hinge line and more gently to 

 the lower margin. From the anterior cardinal angle a ver}' short, 

 narrow ridge extends to a small, circular, slightly elevated tubercle 

 which is situated about an equal distance from the hinge line and the 

 anterior margin. The anterior, posterior, and lowei' margins have 

 a narrow, rounded rim that is slightly flattened on the inner side. 



Surface marked by shallow scattered punctte and very line puncta^, 

 as seen under a strong lens. 



Width of valve 1.8 mm.; length 1 nmi; depth about 0.5 mm. 



This species is distinguished from B. sterojfe by its greater width 

 and the form of the ocular tubercle. 



Formation and locaUty. — Middle Cam])rian; compact, bluish-gray, 

 thin-l)edded limestones; from shingle on gravel bar in the Lan Ho. 1 

 mile south of Chen Ping Hsien, southeastern Shensi, China. 



Collected In- Bailey Willis and Eliot Blackwelder, of the Carnegie 

 Institution of Washington Expedition to China. 



BRADORIA ENYO, new species. 



General outline irregularly oval. Hinge line about four-tifths the 

 width of the valve. Anterior cardinal angle nearly a right angle; 

 posterior cardinal angle slightly obtuse; the anterior margin extends 

 from the angle almost directly downward to where it curves and 

 merges into the broadly rounded lower margin; posterior margin 

 very slightly rounded from the angle downward to where it curA'es 

 and merges into the lower margin. Surface moderately and uniformly 

 convex, the highest portion being near the center; a very short, nar- 

 row, low, and somewhat obscure ridge extends obliquely inward from 

 the anterior cardinal angle to a small, slightly elevated ocular tuber- 

 cle; a slight furrow appears to extend from the tubercle obliquely to 

 a point about midwa}' of the hinge line; a little posterior to this and 

 near the hinge line there appears to be a minute low tubercle. 



The surface appears to be minutely punctate under a strong lens. 



