NO. 5 CAMBRIAN TRILOBITES 453 



Marjuniia typa Walcott — Continued. page 



4^. (X2.) Under side of a pygidium showing doublure and four 

 spines. U. S. National Museum, Catalogue No. 62844. 

 The specimens represented by figs. 4, 4a-b are from locality iiq, 

 Middle Cambrian: Marjum formation; hard calcareous shales, 2.5 

 miles east of Antelope Springs, Millard County, Utah. 



Bathyuriscus / sp. undt. (2) 348 



Fig. 5. (Natural size.) Pygidium with a single antero-lateral spine, 

 as in Marjuniia callas, fig. 3b. U. S. National Museum, 

 Catalogue No. 62845. 



The specimen represented is from locality up, Middle Cam- 

 brian: Marjum formation; 2.5 miles soutlicast of Marjum Pass, 

 House Range, Utah. 



