NO. 5 CAMBRIAN TRILOBITES 421 



PAGE 



Bathyuriscus manchuriensis Walcott 344 



Fig. 4. (X3.) Pygidium. U. S. National Museum, Catalogue No. 

 58273. 

 4a, 4^. (X3-) Cranidia flattened in argillaceous shale. These 

 two cranidia are on a piece of shale recorded in U. S. Na- 

 tional Museum Catalogue as No. 57587. 

 AC. (X3-) Thoracic segment. U. S. National Museum, Cata- 

 logue No. 58272. 



The specimens illustrated by figs. 4, ^a-ca are from locality 36h, 

 Middle Cambrian : Fu-chou series, argillaceous shales, Liau-tung, 

 Manchuria, China. 



The above figures are reproduced from plate 23, figs. 2, 2h, and 2c 

 of Cambrian Faunas of China (Carnegie Inst, of Washington, Re- 

 search in China, Vol. 3, 1913). 



