NO. 5 CAMBRIAN TRILOBITES 307 



PAGE 



55. Corynexochus spinulosus Angelin, Corynexochtis bornholmiensis 



Gronwall, Corynexochus delagei Miquel, Corynexochus clavatus 

 (Walcott), Corynexochus stephenensis (Walcott), Corynexochus 

 minor (Walcott), and Corynexochus senectus (Billings) 432 



56. Corynexochus senectus (Billings) and Corynexochus bubaris Walcott 434 



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



busa Walcott, Corynexochus capito Walcott, Corynexochus bren- 

 nus Walcott, and Corynexochus {Bonnia) fieldensis (Walcott).. 436 



58. Asaphiscus wheelcri Meek 438 



59. Asaphiscus iddingsi Walcott and Asaphiscus {?) capella Walcott 440 



60. Asaphiscus calenus Walcott, Asaphiscus comma Walcott, and Cory- 



nexochus (Bonnia) busa Walcott 442 



61. Asaphiscus ? unispinus Walcott, Asaphiscus ? granulatus Walcott, 



Asaphiscus ? minor Walcott, Blountia mimula Walcott, Blountia 

 alexas Walcott, Blountia ? alemon Walcott, Blountia anser Wal- 

 cott, and Asaphiscus calanus Walcott 444 



62. Asaphiscus (Blainia) gregarius Walcott and Asaphiscus (Blainia) 



paiila Walcott 446 



6t,. Asaphiscus {Blainia) glabra Walcott, Asaphiscus ? anaxis Walcott, 

 Asaphiscus ? sp. undt. (2), Asaphiscus (Blainia) elongatus Wal- 

 cott, Asaphiscus f Aorus Walcott, Asaphiscus ? cf. florus Walcott. 

 Asaphiscus ? duris Walcott, and Asaphiscus ? agatho Walcott. . . . 448 



64. Blountia alethes Walcott, Blountia andreas Walcott, Blountia amagc 



Walcott, Maryvillia arion Walcott, Maryvillia ariston Walcott, 

 Corynexochus (Bonnia) parvulus (Billings), and Dorypyge rich- 

 thofeni Dames 450 



65. Dolichometopus (Housia) varro Walcott, Bathyuriscus (Poliella) 



probiis Walcott, Marjumia callas Walcott, Marjumia typa Wal- 

 cott, and Bathyuriscus ? sp. undt. (2) 452 



66. Ogygopsis klotzi (Rominger), Orria elegans Walcott, and Lisania ? 



breviloba Walcott 454 



67. Pagetia bootes Walcott and Pagetia clytia Walcott 456 



INTRODUCTION 



This is the third of a series of papers on Cambrian Geology and 

 Paleontolog}^ that bears the title " Cambrian Trilobites." Reference 

 to earlier papers may be found on page i6o of this volume. 



The present paper deals principally with the species of the genera 

 Corynexochus, Dolichometopus, Bathyuriscus, Asaphisciis, and 

 Blountia, and more incidentally with species of the genera Illcenurus, 

 Lisania, Marjumia, Maryvillia, Mesonacis, Ogygopsis, and Orria. 



The genus Corynexochus and its, subgenus Bonnia are of special 

 interest to the geologist, as the geographic distribution of the species 

 C. senectus and the two closely related species of Bonnia — C. 

 (Bonnia) parvulus and C. (Bonnia) iieldensis — afiford a means of 



