30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



BATHYURISCIDAE Richter 

 BATHYURISCUS Meek, 1873 

 BATHYURISCUS POLITUS, n. sp. 

 Plate 2, fig. 9 

 Present collections have yielded a single small Bathyuriscus 

 pygidium, which belongs to the spined group of the genus. Even 

 though there is but this one small tail, its generic position is certain. 

 The axis is cylindrical and extends to the rear margin, in cross 

 section standing completely above the flat pleural lobes. Both' the 

 pleural grooves and the pleural furrows are retained, the latter ending 

 in deep depressions next to the rim. The rim is narrow and extends 

 into stout spines at the anterior angles. 

 Locality 54s. 

 Holotype. — U.S.N.M. No. 08499. 



POLIELLA Walcott, 19 16 

 POLIELLA WASATCHENSIS, n. sp. 



Plate 13, fig. 16 



An entire individual and a pygidium with the major portion of a 

 thorax represent the species. It occurs in a shaly matrix, associated 

 with Alokistocarella brighamensis. Its precise stratigraphic position 

 is not known, and it is here included because of its association. 



As a whole P. zuasatchensis has the ovate shape characteristic of the 

 genus. The glabella occupies the full length of the cranidium except 

 for a narrow rim. It expands forward in the usual manner of the 

 genus. Owing to the fact that the hypostoma has been pressed into 

 the glabella, furrows and convexity are not determinable. The eyes 

 are about normal in size and position. Anterior to the eyes the suture 

 diverges and behind the eyes long narrow posterolateral limbs are 

 formed. The fixigenes are almost eliminated at the anterior end of 

 the eye. The libragenes are attached. They are simple, of normal 

 size and have a narrow rim. Genal spines extend to about the fourth 

 thoracic segment and are directed away from the thorax. 



Thorax has nine segments. The rather long spines are spread out in 

 open fashion. 



The pygidium is fairly large, with the slender axis extending about 

 three-fourths its length. A postaxial ridge continues to the indented 

 rear border. Fusion has not wholly eliminated the pleural grooves. 

 The pleural furrows are traceable almost to the margin across the 

 slightly concave flattened border. 



Locality 20x. 



II olotype.— U.S.N.M. No. 98500. 



