CONTENTS OF VOL. lY. 



Paoes. 



Preface yii 



Introductory remarks upon the Upper Helderberg, Hamilton, Portage and Che- 

 mung groups, with list of genera noticed in the volume 1- 4 



Genus Linqula and descriptions of species of the genus 5 - 15 



" DisciNA " " " , 15-26 



«' Crania <« •« " of the genus 26- 30 



" Pholidops " " " " 31-32 



" Orthis " " «« «« 33-63 



•« Streptorhtnchcs «« " " 64-75 



" Strophomena " «« " 76-77 



" Strophodonta " «• «< 78-114 



«» Chonetes : observations upon and descriptions of species of the genus 115-145 



" Productus and Strophalosia : observations upon the genera 146-153 



Subgenus Productella and description of species 153 — 185 



Genus Spirifera and descriptions of species of the genus 186 - 257 



Subgenus Amboccelia and descriptions of species 258 - 262 



Genera Cyrtia and Ctrtina : observations upon 263 - 265 



Descriptions of species of Ctrtina 265 - 271 



Genus 'Riematospira and descriptions of species 271 - 276 



" Rhtnchobpira and description of species 276 - 278 



" Ndcleospira " " 278-281 



«« Athtris and observations upon 282 - 285 



" •« descriptions of species of 285 - 294 



" Meristella and observations upon 295 - 299 



" " descriptions of species of 299 - 



Subgenus Pentaqonia 309 - 



Genus, Atrtpa and descriptions of species 312-327 



'< CcELOSPiRA and description of species 828 - 330 



Family Rhtnchonellid^ 331 



Genus Rhtnchonella 332 - 334 



Subgenus Stenocisma 335 



<< •< descriptions of species 335-354 



Genua Leiordtnohiis and descriptions of species 355 - 364 



" Leptoccelia and description of species 365 - 366 



" Camarophoria " " 867-368 



Observations on the Genera Pentamerus, Pentameeella, Stricklandinia, 



Amphiqenia, RENssELiERiA, etc 869 - 874 



