CA MBRIA N FA UNA S OF CHINA— WA L CO TT. 101 



straight to where it inerg-es into the broad curve of the lower part of 

 the valve. 



Surface of the valve wrinkled to such an extent that it looks like 

 wrinkled parchment. What may be an ocular tubercle occurs a short 

 distance from the hinge and anterior margin. Surface minutely 

 punctate under a strong lens. 



^^'idth, :2.25 mm.; length. 2 mm.; depth unknown, as the flexible 

 test has been compressed. 



This species ditiers from Aluta JJexilis Matthew" in having a straight 

 hinge line; in this respect it resembles some forms of Leperditia. 

 For the present it is referred to Bradoria on account of its close 

 resemblance to Bradorht sterope. 



Formation and load it y. — The specimens were collected fi'om a 

 fragment of compact, bluish-g-ray, thin-bedded limestone, containing 

 fragments of a trilobite that suggests Dorypyge. On this account the 

 horizon is referred to the IMiddle Cambrian. 



Collected from shingle on a gravel bar in the Lan Ho. 1 mile south 

 of Chen Ping Hsien, southeastern Shensi. China. 



Collected by Bailey Willis and Eliot Blackwelder, of the Carnegie 

 Institution of Washington Expedition to China. 



BRADORIA STEROPE, new species. 



Outline of shell obliquely semicircular. Hinge line straight, nearly 

 as long as the width of the valve. Anterior cardinal angle about 80^; 

 anterior curve obsolete; from the anterior cardinal angle the margin 

 .slopes downward and slightly inward, curving gentl}' into the ]>roadly 

 rounded lower margin; posterior cardinal angle slightly obtuse; pos- 

 terior margin curves gently from the angle to the broad curve Of the 

 lower side of the v^lve, which gives a broadly rounded posterior end. 

 The valve is rather stronglv convex, rising to the greatest height near 

 the center. The surface is mai-ked l)v a very narrow rim; from the 

 anterior cardinal angle a narrow ridge extends obliquely inward about 

 one-half the distance toward the center, and terminates in a slight 

 tubercle; on the anterior side there are three shallow depressions, as 

 though the surface had been indented; on the posterior side there is 

 one larger depression directly back of the tubercle at the end of the 

 ridge, and a slight depression in the angle formed by the ocular ridge, 

 the hinge line, and the ridge between the two depressions. 



Surface with minute scattered punctw, as seen under a strong lens. 



The valve has a width of 1.125 mm.; length, 0.8 mm.; depth, about 

 0,2-5 mm. 



In outline this species resembles Bradoria fragiUs; it ditiers in its 

 stronger shell and distinctly marked ridge and ocular tubercle. 



« Trans. N. Y. Acad. Sd., XV, 1896, p. 198. 



