XX 



INTRODUCTION. 



States have produced no Trilobites, their Crustacean fossils being mostly Phyl- 

 LOCARIDA. They arc : 



i 



1 1 



tocaris multinodosa. 

 Mesothyra Oceani. 

 Spathiocaris Etnerson i. 

 DipteroearU i» nwB-Dasdali. 

 J>ipli rocaris pes-ci rva . 

 Palwopalwmon N< wot rryi. 



Chemung group. 

 In the sandstones of this period the Trilobites are represented by two 

 species. Phacops nupera (sec page 27) and Cyphaspis lavis ; the Xiphosura, by 

 pecies Protolimulus Eriensis ; the Eurypterida, by Earypterus Beecheri ; the 

 Phyllocarida, by : 



"j-imitn. 



Ti-opidocarls InU rrupta. 

 Dipterocaris Proene, 



li'iph rocaris pes-cervcB. 



The Cirripedia are represented by Turrikpas (?) Newberry i ; making a total of 

 eleven species. 



Catskill group. 

 The sandstones of the town of Andes, Delaware county, and of Meshoppen, 

 Wyoming county, Pennsylvania, have furnished specimens of the only known 

 Crustacean from this formation, SI ylonur us excels/or. 



