478 Eeport of the State Geologist. 



In Miller's "JSTorth American Geology and Palaeontology," 

 1889, the names of 1093 species of Bryozoa are given, occurring 

 in the different geological formations of this country, as follows : 



Species. 



Chazy _ 6 



Trenton 79 



Hudson Kiver 141 



Clinton 15 



^Niagara ; 95 



Low*er Helderberg 86 



Corniferous : 201 



Hamilton 203 



Chemung , 2 



Sub-Carboniferous 229 



Carboniferous 34 



Permian 3 



But no significance can be attached to these figures, as the 

 Bryozoa of some of the formations have been more thoroughly 

 studied than those of others. For instance, though more forms 

 have been described from the Lower Carboniferous than from 

 the Hamilton Group, more than sixty additional species of the 

 Fenestellid^ alone from the Hamilton Group have been described 

 in manuscript from the State of New York, and these occur in a 

 comparatively small collection. It is safe to say that not one- 

 half of the species of Bryozoa occurring in this country have yet 

 been described. 



Sub-kingdom MOLLUSCOIDEA. 

 Class BRYOZOA. 

 Order Gymnolcemata. 

 Sub-order Chilostomata. 

 Family Fenestellidae, King, emend. 

 Anastomopoka. Archimedes. Archimedipora. 

 CvoLOPiRiNA. Fenestella. Fenestralia. Fenestrapora. 

 Flabellipora. Flabelliporella. Helicopora. Hemitrypa. 

 Isotrypa. Loculipora. Lyropora. Lyroporidra. 



LyROPORINA. LyROPORELIA. PflYLLOPORA. PoLYPORA. 



