( J.) 

 NOTICE OF VOL. IV OF THE PALJIONTOLOGY OF NEW YORK. 



In consequence of the delay in the completion of the plates of this 

 volume, which are to accompany the text, it cannot be issued until some 

 time during the year of 1867; although about two hundred pages were 

 already printed in 1865. 



The volume is entirely devoted to the Brachiopoda of the Upper Hel- 

 derberg, Hamilton, Portage and Chemung groups; giving essentially a 

 Monograph of this class of fossils of the Devonian period. The genera 

 are arranged in a certain zoological order, and the title of each plate 

 indicates the formation to which the species it contains belong. 



The order adopted, and the list of genera under which species are 

 described or discussed, are as follows : 



LiNGULA, 

 DiSCINA, 



Crania, 



PhOLIDOPS, = PSEUDOCRANIA, 



Orthis, 



Streptorhtnchus, 



Strophomena, 



Strophodonta, 



Chonetes, 



Produotus, 



Strophalosia, 



Productella, 



Spirtfera, 



Cyrtina, 



Ctrtia, 



Trematospira, 



Rhynchospira, 



nucleospira, 



Retzia, 



Athyris, 



Meristella, 



Meristina, 



Pentagonia, 



Atrypa, 



ccelospira, 



Rhynchonblla =: Stenocisma, 



Leioryhytstchus, 



Leptoccelia, 



Camarophoria, 



Pentamerus, 



Stricklandinia, 



Pentamerella, 



Gypidula, 



Amphigenia, 



Renssel^ria, 



Terebratula, 



Cryptonella, 



Centronella, 



Tropidoleptus, 



Vitumna. 



