8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 97 



AGNOSTIDA 



AGNOSTUS Brongniart, 1822 



AGNOSTUS BONNERENSIS Resser 



Plate 2, figs. 24-26 



.lyiiostits bonncrcnsis Resser, Smithsonian Misc. Coll., vol. 97, no. 3, p. 6, 

 pi. I, figs. 16, 17, 1938. 



This species is abundant in the Spence shale. 



Middle Cambrian, Lakeview; (loc. 37n) Lakeview, Pend Oreille 

 Lake, Idaho. 

 Locality 55c. 

 Plesiotypes. — U.S.N.M. no. 96499. 



AGNOSTUS BRIGHAMENSIS, n. sp. 



Plate 2, figs. 27-29 



Photographs of this species are mounted to show the associated 

 fauna, Oryctocephalus, Pagetia, Clavaspidclla, and Lingiildla. 



Compared with A. honncrensis, this species differs first in its more 

 circular outline for both shields. Little further difference is noticeable 

 in the head. A sharp difference is brought aliout in the pygidium 

 by the deeper transverse rhachial furrows but more particularly by 

 the failure of the rear rhachis to penetrate the pleural lobe. 



Locality 20x. 



Holotypc and parafypcs. — U.S.N.M. no. 96500. 



TRILOBITA 



PAGETIDAE Kobayashi 



PAGETIA Walcott, 1916 



PAGETIA CLYTIA Walcott 



Plate 2, figs. 30-32 



I'(U/rtia clytia Walcott, Smithsonian Misc. Coll., vol. 64, no. 5, p. 40(S, pi. 67, 

 figs. 2-2e, 1916. 



In spite of the great abundance of this trilobite it is difficult to find 

 really good specimens. 

 Localities 55c and 20x. 

 Cotypes. — U.S.N.M. nos. 62862-7. 



