(I.) 



NOTICE OF VOLUME IV OF THE PALilONTOLOGY OF NEW-YORK. 



Albany, December 1866. 



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 : 



LlNGULA, 

 DiSCINA, 



Crania, 



PhOLIDOPS, = PSEUDOCRANIA, 



Orthis, 



Streptorhynchus, 



Stropiiomena, 



Strophodonta, 



Chonetes, 



Productus, Strophalosia and 



Productella, 



Spirifera, 



Cyrtina and Cyrtia, 



Trematospira, 



Rhynchospira, 



nucleospira, 



Retzia, 



Athyris, 



Meristella and Meristina, 



Pentagonia, 



Atrypa, 



ccelospira, 



Rhynchonella = Stenocisma, 



Leiorhynchus, 



Leptoccelia, 



Camarophoria, 



Pentamerus, 



Stricklandinia, 



Pentamerella, 



Gypidula, 



Amphigenia and Renssel^eria, 



Terebratula, 



Cryptonella, 



Centronella, 



Tropidoleptus, 



Vitulina. 



The linguloid forms of this period have not exhibited the characteristics 



of the Lower Silurian form Lingulepis, and are for the present continued 



under the old Genus Lingula ; of which we have in the Upper Helderberg 



group the following species : 



Lingula ceryx, 



L. desiderata, • 



L, manni ; all new species. 



19 



[ Published March 1867.1 



