26 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



Middle Cambrian, Eldorado ; east side Secret Canyon, Eureka dis- 

 trict, Nevada. 



Cotypes. — U.S.N.M. no. 24610. 



Ehmania smithi (Walcott) 



Anovwcarella smithi Walcott, Smithsonian Misc. Coll., vol. 57, no. 4, p. 92, 

 pi. 17, figs. Z-id, 191 1. Research in China, vol. 3, Carnegie Inst. Publ. 

 54, p. 203, pi. 19, figs. 16-166, 1913. 



Middle Cambrian, Conasauga; (loc. 90x) 3 miles east of Center, 

 Alabama. 



Cotypes. — U.S.N.M. nos. 58296, 58298. 



ELDORADIA, n. gen. 



Still another group formerly referred to Alokistocare deserves a 

 separate generic name, and since it seems to reach its best develop- 

 ment in the Eldorado limestone of the Eureka District, Nevada, may 

 appropriately be named for the formation. 



Diagnosis. — Cranidium generally rectangular in outline, with a 

 tapering glabella about half as long as the cranidium ; usually well 

 defined by shallow dorsal furrows ; glabellar furrows faint or absent. 

 Brim wide, usually with a large median boss ; rim not sharply sepa- 

 rated owing to the poor development of the anterior furrow. Fixed 

 cheeks usually wide, with small, sometimes stalked eyes about op- 

 posite the anterior end of the glabella. 



Comparisons. — Compared with Bolaspis and Acrocephalops, this 

 genus lies between the two but nearer to the former. From this it 

 differs in greater width of fixed cheek, less clearly defined rim and 

 shallower furrows. 



Genotype. — Ptychoparia ? linnarssoni Walcott. 



Range. — Presumably confined to the Middle Cambrian. 



DESCRIBED SPECIES REFERRED TO ELDORADIA 



Eldoradia linnarssoni (Walcott) 



Ptychoparia ? linnarssoni Walcott (part), U. S. Geol. Surv. Monogr. 8, p. 47, 



pi. 9, fig. i8a, 1884. (Not i8 = £. lata.) 

 Alokistocare linnarssoni Walcott (part), Smithsonian Misc. Coll., vol. 64, 



no. 3, p. 185, pi. 25, fig. 7, and possibly the cheek inset in fig. ya, 1916. 



(Not '/a=^E. lata.) The best cranidium was not figured. 



Middle Cambrian Eldorado; (loc. 58) east side of New York 

 Canyon, Eureka District, Nevada. 

 Cotypes. — U.S.N.M. no. 2461 1. 



