102 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



Forniiifioi) and JocaHfij. — Middle C;im)>riiin; compact, bluish-g-ray, 

 thin-lx'ddod limestone; .shingle on gravel bar in the Lan Ho, 1 mile 

 •south of ChCMi Ping H.sien, southeastern Shensi. China. 



Collected b}^ Bailey Willis and Eliot Blackwelder, of the Carnegie 

 Institution of Washington Expedition to China. 



BRADORIA WOODI, new species. 



Outline of shell obliquely semicircular. Hinge line straight, a 

 little shorter than the greatest width of the shell. Anterior cardinal 

 angle about 70'-'; posterior cardinal angle obtuse. Posterior margin 

 has a gentle curvature from the angle, which gives it a broadly 

 rounded outline down to where it merges into the broadly rounded 

 lower side; anterior margin almost straight and then gently curving^ 

 into the lower margin. Surface rather convex, with the highest 

 portion at the ridge around the central depression. The outer rim 

 is very narrow and slightly rounded. From the anterior cardinal 

 angle a narrow, sharp ridge extends obliquely inward and forward to 

 a little below the center and arches aromid a rather large, depressed 

 central space, terminating a short distance before completing a circuit 

 of the space; between the ridge described and the hinge line are two 

 spaces outlined b}^ the main ridge; of these the one nearest the ante- 

 rior cardinal angle is somewhat depressed and outlined b}^ a shallow 

 furrow extending at right angles to the hinge line from the ridge to 

 the hinge line. At a point about two-thirds the distance of the length 

 of the hinge line a short and very slight ridg-e extends toward the hinge 

 line from the main ridge; between this and the slight furrow there is 

 a slightl}^ convex area. Two minute tubercles occur on the long cen- 

 tral ridge, one at the point where it begins the loop to inclose the 

 depressed central space, and the other on the opposite side of the 

 depressed space. 



Surface minutel}' punctate under a strong lens. 



Entire width of valve 'i mm. ; length 1.25 nmi. ; depth about 0.5 nmi. 



This species is distinguished from Bradovla sterope by its wider 

 valve and the presence of the central ridge and depressed space. 



The specific name is given in recognition of the most excellent and 

 thorough preparatory work that was done by Miss Elvira Wood in 

 the preliminar}^ stud}- of the Cam1)rian fossils from China and her 

 work upon the Devonian crinoids. 



Formation and locaUfy. — Middle Cambrian; compact, bluish-gray, 

 thin-bedded limestone; from shingle on gravel bar in the Lan Ho, 1 

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



Collected by Bailey Willis and Elliot Blackwelder, of the Carnegie 

 Institution of Washington Expedition to China. 



