NO. 4 CAMBRIAN FAUNAS OF CHINA 97 



Formation and locality. — Middle Cambrian: (91) Conasauga 

 (Coosa) shales, at Cedar Bluff, Cherokee County, Alabama; (16) 

 limestones in Conasauga (Coosa) shales, Blountsville Valley, Blount 

 County, Alabama; and (107) limestone in Bull Run, northwest of 

 Copper Ridge, 11 miles (17.6 km.) northwest of Knoxville, Knox 

 County, Tennessee. 



Collected by A. M. Gibson and Cooper Curtice. 



COOSIA ROBUSTA, new species 



Plate 16, figs. 2, 2a 



Of this species the cranidium and .pygidium are known. The 

 cranidium differs from that of C. superba (pi. 16, fig. i) in having 

 a proportionately more elongate glabella, more convex frontal 

 border, and narrower postero-lateral limbs. 



The pygidium differs in being more elongate, in having a propor- 

 tionately longer axial lobe, and less flattened pleural lobes. 



Formation and locality. — Middle Cambrian : ( 107) limestone in 

 Bull Run, northwest of Copper Ridge, 11 miles (17.6 km.) north- 

 west of Knoxville, Knox County, Tennessee. 



Collected by Cooper Curtice. 



BATHYURISCUS MANCHURIENSIS, new species 

 Plate 16, figs. 4 



This species is founded on numerous specimens of the cranidium. 

 free cheeks, thoracic segments, and pygidia that are compressed in 

 a fine argillaceous shale. Unfortunately, there are no entire speci- 

 mens of the dorsal shield. 



As restored by combining the free cheeks and cranidium. the 

 cephalon is semicircular in outline and moderately convex. It is 

 bordered by a narrow, slightly roimded margin that is separated by 

 a sharply defined narrow furrow from the glabella and the slope of 

 the free cheeks. The posterior border is very narrow, elevated, and 

 separated from the fixed cheek by a strongly defined furrow ; the 

 palpebral lobes are narrow and a little less than one-fourth the 

 length of the cephalon, Genal angles extended into short, sharp, 

 backward curving spines. The cranidium is broad at the base, 

 narrowing toward the front ; the antero-lateral limbs are very small 

 and disappear where the palpebral lobe touches the dorsal furrow ; 

 the postero-lateral limbs and narrow fixed cheeks merge into each 

 other so as to form transversely subtriangular areas, with the narrow 

 palpebral lobes on their front outer margins. 



