84 THE HABITAT OF THE EURYPTERIDA 



THE EURYPTERID FAUNAS AND ASSOCIATED ORGANISMS 



In the following lists the eurypterid faunas of the various occur- 

 rences is given, as well as the organisms other than eurypterids which 

 are found associated with them. No account is taken here of single 

 occurrences or of the presence of a few fragments in normal marine 

 faunas. 



ORDOVICIC 



NORMANSKXLL FAUNA. 



Eurypterids-. 



Dolichopterus breviceps 



Eusarcus linguatus 



Eurypterus chadwicki 



Pterygotus ? nasutus 



P. normanskillensis 



Stylonurus modestus 

 Associated organisms. Seaweeds and graptolites. 



Rhombodictyon 



Climacograptus bicornis 



C. bicornis var. peltifer 

 Cryptograptus tricornis 

 Dicellograptus gurleyi 



Schenectady Fauna. 

 Eurypterids: 



Dolichopterus frankfortensis 



D. latifrons 

 Eurypterus ruedemanni 



E. pristinus 

 E. ? stellatus 

 Eusarcus ? longiceps 

 E. triangulatus 

 Hughmilleria shawangunk 

 Pterygotus ? nasutus 



P. prolificus 

 Stylonurus limbatus 

 Associated organisms. 



In sandy shales, seaweed, Sphenothallus latifolium 

 In black shales, graptolites and trilobites 

 Climacograptus bicornis 

 Triarthrus becki 



SILURIC 



Earliest Lower Siltjric (Eei.) Fauna of Bohemia. 



Eurypterids. 



Eurypterus acrocephalus 

 Pterygotus barrandei 



