54 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Genotype. — Ptychoparia piochensis Walcott (Bull. U. S. Geol. 

 Surv., 3o, 1886, p. 201, pi. 26, fig. 2 and pi. 28, figs, i and 2). 

 Range. — Middle Cambrian of Great Basin and Rocky Mountains. 



ANORIA new genus 

 PI. 9, fig. 2. (Nat. size.) Diagrammatic outline of the type species. 

 Anoria is characterized by the absence of a frontal border. 

 Genotype. — Dolichometopus tontoensis Walcott (Smithsonian A'lisc. 

 Coll. 64, 1916, p. 373, pi. 51, fig. I ). 



Range.' — Upper Cambrian, Grand Canyon. 



ARMONIA new genus 



PI. 10, fig. I. (Nat. size.) Diagrammatic outline of type species. 

 Armonia differs from Elrathia in the characters of the frontal 

 limb and the relatively larger pygidium. 



Genotype. — A. pelops Walcott, new species. 

 Range. — Upper Cambrian, Southern Appalachians. 



BELLEFONTIA 



Ulrich (MSS.) New genus, pi. 9, figs. 3, 4 and 5. (Nat. size.) Diagram- 

 matic outlines of the cranidium and pygidium of the type species and of 

 Niobe frontalis (Dalman) and Hemigyraspis affinis (McCoy), the types of 

 the respective genera. 



Belief ontia differs from the similar genera in the characters of the 

 pygidium and the absence of a dorsal furrow. 



Genotype. — Hemigyraspis collieana Raymond (Carnegie Mus., 

 Annals, vol. 7, no. i, 1910, p. 41, pi. 14, figs. 9-13). 



Range. — Canadian, Central Pennsylvania, Ozarkian of the Rocky 



Mountains. 



BURNETIA new genus 



PI. 10, fig. 2. Diagrammatic outline of the cranidium. 



This genus is characterized by the peculiar wide frontal limb. Other 

 parts of this trilobite unknown but possibly included in the large 

 unworked collections from the type locality. 



Genotype. — Ptychoparia (f) urania, Walcott (Proc. U. S. Nat. 

 Mus., 13, 1890, p. 274, pi. 21, figs. 10, 11). 



Range. — Upper Cambrian of Texas. 



BYNUMIA new genus 

 PI. 14, fig. 3. Diagrammatic outline of cranidium. 

 Bynumia differs from Ucebia and Kingstonia in the deeper dorsal 

 furrow and prolonged frontal Hmb. 

 Genotype. — B. eumus, new species. 

 Range.- — Upper Cambrian, British Columbia. 



