CAMBRIAN GEOLOGY AND PALEONTOLOGY 



V 



No. 3.— CAMBRIAN AND OZARKIAN TRILOBITES 



By CHARLES D. WALCOTT 



(With Plates 15 to 24) 



CONTENTS 



PAGE 



Introduction 64 



Description of genera and species 65 



Genus Amecephalus Walcott 65 



Amecephalus piochensis (Walcott), Middle Cambrian (Chis- 



holm) 66 



Genus Anoria Walcott 67 



Anorta tovtoensis (Walcott), Upper Cambrian 68 



Genus Armonia Walcott 69 



Armonia pelops Walcott, Upper Cambrian (Conasauga) 69 



Genus Belief ontia Ulrich 69 



Belief ontia collieana (Raymond) Ulrich, Canadian 72 



Belief 07itia nonius (Walcott), Ozarkian (Mons) y2 



Genus Bowmania, new genus 73 



Bonmiania americana (Walcott), Upper Cambrian y^ 



Subfamily Dikelocephalinae Beecher 74 



Genus Briscoia Walcott _. 74 



Briscoia sinclairensis Walcott, Ozarkian (Mons) 75 



Genus Burnetia Walcott yj 



Burnetia urania (Walcott), Upper Cambrian yj 



Genus Bynumia Walcott 78 



Bynumia eumus Walcott, Upper Cambrian (Lyell) 78 



Genus Cedaria Walcott 78 



Cedaria proUUca Walcott, Upper Cambrian (Conasauga) 79 



Cedaria tennesseensis, new species, Upper Cambrian .' . . . 79 



Genus Chancia Walcott 80 



Chancia ebdome Walcott, Middle Cambrian 80 



Chancia evax, new species, Middle Cambrian 81 



Genus Corbinia Walcott 81 



Corbinia horatio Walcott, Ozarkian (Mons) 81 



Corbinia valida, new species, Ozarkian (Mons) 82 



Genus Crusoia Walcott 82 



Crusoia cebes Walcott, Middle Cambrian 82 



Genus Desmetia, new genus 83 



Desmetia annectans (Walcott) , Ozarkian (Goodwin) 83 



Smithsonian Miscellaneous Collections, Vol. 75, No. 3 



61 



