6 CONTENTS. 



Geologic data— Continued. 



Detailed stratigi'aphic distribution of Cambrian and Ordovician Brachiopoda — Continued. Page. 



Michigan 136 



Minnesota - 136 



Missouri 137 



Montana and Wyoming - 137 



Nevada: Barrel Spring 137 



Nevada: Eureka District - 139 



New Bi-unsyyick. . , , 140 



Newfoundland: Manuels Brook, Conception Bay 140 



New York 141 



Norway 141 



Nova Scotia 141 



Oklahoma: Arbuckle Mountains 141 



Ontario 143 



Pennsylvania 143 



Quebec, Ontario, and Labrador 143 



Bussia 143 



Scotland 144 



South Dakota and Wyoming , 144 



Sweden, Denmark, Finland, and Norway ■. 144 



Tennessee, Georgia, and Alabama 147 



Texas 148 



Utah: Blacksmith Fork, Cache County 148 



Utah: House Range, Millard County ^ 153 



Vermont - 1^9 



Virginia and Maryland - 159 



Wales , 159 



Wisconsin, Michigan, Minnesota, and Iowa - 159 



Wyoming 159 



Habitat 159 



List of genera and subgenera, alphabetically arranged, giving number of species occurring in the dif- 

 ferent types of sediment 160 



Localities 160 



LocaUties 1-227, U. S. National Museum 161 



Locahties 300-396z, arbitrarily numbered 229 



Locahties C1-C75, Carnegie Institution of Washington Expedition to China 286 



Zoological discussion - 291 



Terminology 291 



General statement 291 



Definitions 292 



The brachiopod shell - 296 



Structure 296 



General statement. : ' 296 



Microscopic structure 297 



Slirface ornamentation 300 



General statement 300 



Atremata 301 



Neotremata 302 



Protremata 302 



Interlocking plications ' " 303 



Cardinal area - - - ^^^3 



Atremata - 303 



Neotremata*. 304 



Protremata 305 



Delthyrium and deltidium 305 



Listrium 306 



PseudochiUdium 306 



Cardinal process 306 



Articulating processes 307 



Spondyhum 307 



Crurahum 309 



Platform - 309 



Septa 310 



Dental plates 310 



