NO. 12 SPENCE SHALE AND ITS FAUNA KESSER IT 



outer pair, the other spines being reduced to a serrated border. The 

 long thoracic spine is not on the fifth but the last segment. 



LocaHty 55c. 



Holotype. — U.S.N.M. no. 96522; paratypes, nos. 53435-6-7, 53440. 



DOLICHOAIETOPINAE Walcott 



BATHYURISCUS Meek, 1873 

 BATHYURISCUS ATOSSA Walcott 



Plate 5, fig. 15 



Bathyuriscus atossa Walcotf, Smithsonian Misc. Coll., vol. 64, no. 5, p. 336, 

 pi. 48, figs. 2, 2a-b, 1916. Resser, Smithsonian Misc. Coll., vol. 93, no. 5, 

 P- 15, 1935- 



Locality 55c. 



Lcctotypc. — U.S.N.M. no. 62642; paratypes, nos. 62643-4. 



BATHYURISCUS BRIGHAMENSIS, n. sp. 



Plate 5, figs. 3, 4 



This species is fully typical of the genus. It is characterized by a 

 ralher wide glabella, nine thoracic segments, and a rather wide 

 pygidium. A broad indentation notches the rear margin rather deeply, 

 and the anterior marginal pygidial spines are small. 



The holotype evidently is a pathological specimen, for the anterior 

 pleural segments on the right side have coalesced and in healing an 

 injury have produced an extraordinarily long spine. 



Locality 20x. 



Holotype and paralype. — U.S.N.M. no. 96524. 



POLIELLA Walcott, 1916 



POLIELLA CARANUS (Walcott) 



Plate 2, fig. 21 



Batliyiiriscus (Policlla) caraiius Walcott, Smithsonian Misc. Coll., vol. O4, 



no. 5- p. 350, pi. 46, fig. 5, 1916. 

 Poliella caranns Resser, Smithsonian Misc. Coll., vol. 93, no. 5, p. 44, 1935. 



Locality 55c. 

 Holotype.—U.SMM. no. 62628. 



