NO. 1415. C4MBRIAN FAUNAS OF CHINA— WALCOTT. 93 



broad and strongly defined; occipital ring narrow at the ends, rounded, 

 and rather strong- in the central portions; dorsal furrows clearly 

 defined on the sides, but obscure in front of the glabella. 



Fixed cheeks about one-half the width of the glabella; posteriorly 

 the}" slope downward into postero-lateral limbs that are about twice as 

 long as the width of the fixed cheeks; toward the front the fixed cheeks 

 slope abruptly downward and merge into the frontal limb; ocular 

 ridges low and broad, merging into the strong palpebral lobe; postero- 

 lateral limbs grooved near the posterior margin by a strong furrow; 

 frontal limb short, almost flat, and sloping abruptl>' from the front of 

 the glabella down to the strong, nearly flat, frontal rim; the body of the 

 associated free cheek is subquadrilateral in outline, marginal borders 

 strong, clearly defined, and produced behind into a strong, slightly 

 curved, rounded spine. 



Thorax unknown. 



The associated pygidium is quadrilateral in outline, exclusive of the 

 strong, slightly diverging postero-lateral spines, which are a little 

 longer than the length of the pygidium; sides of the pygidium sub- 

 parallel or slightly diverging toward the base of the spine; posterior 

 margin nearly transverse; axial lobe prominent, convex, and reaching 

 nearly to the posterior margin; the sides converge slightly toward 

 the l)lunth' pointed posterior end; divided by three transverse furrows 

 into three segments and a strong terminal portion, which is marked at 

 the point where the axis slopes abrupth' downward by the small node 

 on each side; the pleural lo])cs are limited to a rather large anterior 

 lobe and an obscure secondary lobe, which appears to merge back- 

 ward into the postero-lateral spine. 



Surface apparently smooth under a strong lens; a few scattered 

 punct{\3 occur on the glal)ella. The largest head has a length of 10 

 mm., with a width of 12 mm. at the palpe))ral lobes. 



This species difl'ers from CreplvepJudus io-zrensis^ to which it appears 

 to be most nearly related, by the form of the frontal limb and rim of 

 the glabella and other details; the pygidium is not as broad, and it also 

 difl'ers in outline. 



For}}iat'wn and loadity. — Middle Cambrian, Chang Hsia formation, 

 near upper part, in a dai'k oolitic limestone; in clifl's 1 mile east of 

 Chang Hsia, Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



CREPICEPHALUS MAGNUS WalcoU. 



The only portions of this species in the collection are a fragment of 

 the posterior portion of the glabella and the outer portion of a large 

 free cheek; the fragment shows that the glabella had a width at the 

 base of 12 mm.; also, that there was a narrow, strong occipital groove 



