CAMBRIAN GEOLOGY AND PALEONTOLOGY 

 III 



No. 5.— CAMBRIAN TRILOBITES 



By CHARLES D. WALCOTT 



(With Plates 45 to 67) 



CONTENTS 



PAGE 



Introduction 307 



Descriptions of genera and species 308 



Family Corynexochidae Angelin 308 



Corynexochus Angelin 309 



Coryncxochus bornholmicnsis Gronwall (pi. 55, figs. 2, 



2a-b) 313 



Corynexochus brennus, new species (pi. 57, figs. 3, 30-6) 314 

 Corynexochus bubaris, new species (pi. 56, figs. 2, 2a-b, 



3, 3a-f) 314 



Corynexochus capito, new species (pi. 57, figs. 2, 2a-e) 315 

 Corynexochus clavatus (Walcott) (pi. 55, figs. 4, j,a-b) 316 



Corynexochus dclagei Miquel (pi. 55, figs. 2, ^a) 317 



Corynexochus minor (Walcott) (pi. 55, figs. 6, 6a-d) . . 319 

 Corynexochus senectus (Billings) (pi. 55, figs. 7, 7a-c; 



pi. 56, figs. I, la-g) 319 



Corynexochus spinulosus Angelin (pi. 55, figs, i, la-b) 323 

 Corynexochus stephenensis (Walcott) (pi. 55, figs. 5, 



Sa-c) 324 



Bonnia, new subgenus 325 



Corynexochus {Bonnia) busa, new species (pi. 57, fig. 



la; pi. 60, figs. 3, 2,a-c) 326 



Corynexochus {Bonnia) fieldensis (Walcott) (pi. 57, 



figs. 4, 4a-b) 327 



Corynexochus {Bonnia) parvulus (Billings) (pi. 57, 



figs. I, ib-c; pi. 64, fig. 6) 328 



Family Dolichometopinse 330 



Bathyuriscus Meek 330 



Comparison of Bathyuriscus with other genera 2:^2 



Bathyuriscus adaus, new species (pi. 47, figs. 3, 3a-c) . . 334 

 Bathyuriscus anax, new species (pi. 48, figs, i, la-d) . . . 335 

 Bathyuriscus atossa, new species (pi. 48, figs. 2, 2a-b) . . 336 

 Bathyuriscus bantius, new species (pi. 49, figs. 2, 2a-c) 336 

 Bathyuriscus batis, new species (pi. 48, figs. 4, 4a). .. . Z2>7 

 Bathyuriscus belesis, new species (pi. 50, figs, i, la-i) . . 338 



Smithsonian Miscellaneous Collections, Vol. 64, No. 5 



303 



