vi TABLE OF CONTENTS. 



Park. 



CONOTRETA ------------- 104 



DisciNOPSis ------------ 105 



SiNNARSSONIA ------------] 07 



Mesotreta ------------ 109 



SiPHONOTRBTA - -----------HO 



schizambon ------------ 113 



Keyserlinqia ------------ 117 



Helmersenia - --. 119 



DisciNA, Orbicula, Orbiculoidka, Schizotreta, DisfiMscA, Lindstroemella, 



Q^hlertella, Roemerella --------- 120 



Trbmatis ------------ i3g 



hc'hizocrania ------------ 142 



Crania ----••-------.- 145 



Craniella --- ---. 153 



Cardinocrania ----------- 154 



Pholidops -----------■-. 155 



Note to page 128 ------------ - 160 



CONCLUSION -------------- ](3i 



SUPPLEMENT TO THE BRACHIOPODA INARTICULATA - - - - 171 



IL BRACHIOPODA ARTICULATA --------- 185 



Orthis ------- 186 



Orthis - - - - - 192 



Plectorthis ------------ 194 



Diuorthis ------------- 195 



Phesioniys ------------ igg 



Hebertella ----- 198 



Orthostrophia ----------- 199 



Platystrophia ------------ 200 



Heterorthis ------------ 202 



Bilobites ------------- 204 



Dalmaiiella ------------ 205 



Rhipidomella ------------ 208 



Schizophoria ------------ 211 



Orthotichia ------------ 213 



Euteletes ------------ 214 



List of Genera and Species ---------- 220 



Supplementary Note on the Genus Orthis ------ 227 



Billingsella ------------ 2o0 



Protorthis ------- 231 



Clitambonites ------------ 233 



polytcechia ------------ 239 



scbnidium ------------- 241 



Orthidium ------------ 244 



