NO. 3 CAMBRIAN AND OZARKIAN TRILOBITES J'J 



Fragments that may belong to this species occur in the lower part 

 of the Mons at locality 2ip : Ozarkian : Mons formation : Gray lime- 

 stone interbedded in shale of ig of section and a little below faunal 

 horizon of 17s. West slope Sabine Mountain 500 feet (152.4 m.) 

 above south end of Columbia Lake, 2 miles (3.2 km.) north of 

 Kootenay River bridge and about 2 miles (3.2 km.) northeast of 

 Canal Flats Station on Canadian Pacific Railway, British Columbia, 

 Canada. 



Genus BURNETIA Walcott 



Burnetid Walcott, 1924, Smithsonian Misc. Coll., Vol. 75, No. 2, p. 54, pi. 10, 

 fig. 2. 



Description. — A single cranidium and a free cheek assigned to it 

 are the only parts of this trilobite thus far obtained. 



This form is peculiar in several respects. It is characterized by a 

 strongly convex high glabella which arches rapidly from the .occipital 

 furrow to the anterior margin. The occipital and the posterior pair 

 of glabellar furrows are fairly well marked, and a second pair of 

 short anterior furrows is faintly outlined. The dorsal furrow is 

 strongly defined all around. The wide, flaring, steeply inclined, 

 smooth border is slightly concave in front and forms a notable char- 

 acter of the cranidium. 



Fixed cheeks narrow: palpebral lobes and eyes moderately large, 

 and the posterior portion of the palpebral lobe extends to a point in 

 line with the occipital ring: ocular ridges clearly outlined. Free 

 cheek elevated and with a wide border. The facial suture may possibly 

 he intramarginal to the apex. 



Surface of the type species granulose. 



Genotype. — Ptychoparia ? urania Walcott. 



Range. — Upper Cambrian : Texas. 



BURNETIA URANIA (Walcott) 



Plate 17, figs. 1-3 



Ptychoparia ? urania Walcott, 1890, Proc. U. S. Nat. Mus., Vol. 13, p. 274, 



pi. 21, figs. 10, II. (Original description.) 

 Burnetia urania Walcott, 1924, Smithsonian Misc. Coll., Vol. 75, No. 2, p. 54, 



pi. 10, fig. 2. 



The original description outlines what is known of the species. 

 Formation and locality. — Upper Cambrian : (68) Cap Mountain 

 formation. Packsaddle Mountain, Llano County, Texas. 



