NO. 1415. CA MBRIAN FA UNAS OF CHINA— WA LCO TT. 3 1 



The surface of the central portions of the head is a|)i)arentl\' smooth 

 under a strong;- lens, with the exception of a few scattered, depressed 

 tubercles; the free cheeks have a few irreg-ular, raised, inosculating 

 lines extending- from the base of the eye outward toward the rim; the 

 surface of the associated pygidium appears to have a few very minute 

 tubercles that can be seen onl}^ with the aid of a strong lens. 



Ohservationx. — The transverse front of the head of this species sug- 

 gests the head of Coiiocephalites fregueriH Dames, but the glabella is 

 entirelv diti'erent in form. It ditl'ers from Dorypygella alcon and 

 D. (dastor Wsdcotthy the narrower free cheeks and glabella, and the 

 form of the frontal rim. 



Fonnation and loaditij. — Middle Cambrian. In gray, crystalline 

 limestone; 3.25 miles southwest of Yen (Jhuang, Hsin Tai, Shangtung, 

 China. 



Collected b\^ Eliot Blackwclder, of the Carnegie Institution of 

 Washington Expedition to China. 



DORYPYGELLA ALASTOR, new species. 



This species is represented ])y a single specimen of the central por- 

 tions of a moderately convex head and several associated pygidia that 

 occur at the same horizon as Dorypygdla alcon. 



Head, as indicated by the specimen, transversely semicircular and 

 moderately convex. Glabella broadly truncato-conical, narrowing to 

 the gently rounded front; two pairs of narrow, short furrows extend 

 obliquely inward and backward; the posterior pair outline a rather large 

 postero-lateral lobe, wliich is continent with an oval-shaped lobe that 

 interrupts the dorsal furrow and on one side merges into the tixed 

 cheek; a second pair of furrows outlines a small, narrow lobe that is 

 scarcely separated from the tixed cheek by the dorsal furrow; occipi- 

 tal furrow narrow, transverse; occipital ring l)roken awaj^ ; dorsal fur- 

 row slightly outlined in front and at the anterior lateral angles of the 

 glabella, and practically nonexistent l)ack of that at the sides, owing to 

 interruption by the merging of the lobes of the glabella, and the tixed 

 cheeks. 



Fixed cheeks nearly as wide as the anterior portion of the glabella, 

 interrupted by strong, low, ocular ridges that originate at the antei'ior 

 lateral angle of the glabella and extend obliqneh" outward and back- 

 ward to the palpebral lo])e; palpel)ral lobes large, about one-half the 

 length of the head, and rising abruptl}' from the nearh' flat, tixed cheek; 

 their outer margin is broad, roiuided, elevated, semicircular, with a 

 deep groove sloping down to the fixed cheek; frontal limb very nar- 

 row, merely a rounded ridge between the gla])clla and the Hat frontal 

 rim; to the sides it merges into the strong ocular ridge and downward 

 slope of the fixed cheek in front of the ridge; frontal rim narrow, 

 nearly Hat, and rising to the slightly rounded margin. 



