NO. 1415. CA 3f Bin AN FAUNAS OF CHINA— WALCOTT. 29 



For/nation and locality. — Middle Cambrian, central portion of 

 Chang- Hsia formation, in hard, dove-colorod limestone; '1 miles south 

 of Yen Chuang, Hsin Tai, 8hang-tunu-, China. 



Collected by Eliot Blackwelder, of the Carneg-ie Institution of 

 Washington Expedition to China. 



• Genus DORYPYGELLA, new genus. 



This genus is founded on the heads awA ])ygidia of a trilobite 

 associated with Dainesella Mackwelderi. 



D((ignos!s. — Head transversely semicircular, with a truncato-conical 

 glaljella, having a postero-lateral lobe in the dorsal furrow and a nar- 

 row frontal rim and border, tixed cheeks medium to broad, with rela- 

 tively large, elevated, palpebral lobes; facial sutures, cutting the 

 anterior rim in front of the anterior base of the eye lobe, extend 

 inward and backward in a slight outward curve to the eye lobe; arch- 

 ing about the eye lobe they extend outward and backward with a 

 sigmoid flexure, cutting the posterior rim within the postero-lateral 

 angle. 



Associated pygidia transversely semicircular, axis conical, with two 

 or more rings, marginal border spinose, with the anterior pair of 

 spines, in the type species, very strong. 



It may be that some of the pygidia described under Olenoldes and 

 I)mtie><ella belong- to this germs, but with our present knowledge it 

 would be difficult to identity them. 



The genus is characterized l)y the peculiar glabella, narrow frontal 

 margin, and spinose pygidium. It is assumed that the pj'gidia asso- 

 ciated w^th the heads belong to the genus, as there is no other associated 

 form to which they coidd be referred except Daiuesdla blachweldtrl, 

 and from this the pygidium differs in its short conical axis and the 

 character of the spinose border. 



Genotype. — Dorypygella typical! s. 



The species referred to the genus are: Dorypy(jella typicalls Wal- 

 cott, Dorypygella alcon Walcott, Dorypygella alastor Walcott, 



DORYPYGELLA TYPICALIS, new species. 



Head transversely semicircular, moderately convex, Glaljella 

 truncato-conical, with the sides converging gently to the i-ounded front; 

 three pairs of glabellar furrows are indicated by slight, short depres- 

 sions at the sides next to the dorsal furrow; back of the posterior pair 

 of depressions a low rounded ridge extends out onto the tixed cheek, 

 forming a low, oval-shaped tubercle or lobe that is apparently the 

 continuation of the postero-lateral lobe of the gdabella; a small pit 

 occurs just back of it, from which the occipital furrow starts; the 

 latter is shallow, clearly defined, and extends slightly backward and 

 then forward toward the center; occipital ring of medium width at the 

 sides, broadening- out to a somewhat flat, rather strong, segment at the 



