176 



HISTORICAL GEOLOGY 



Fig. 105 

 Pennsylvanian Eucrustaceans : a, Anthrapalcemon gracilis (Meek 

 and Worthen); b, Euproops dance (Meek and Worthen). (From Le 

 Conte's " Geology," permission of D. Appleton and Company.) 



the former having made their first known appearance. They looked 

 much like existing forms (Fig. 106). Eurypterids still continued 



a b 



Fig. 106 



Pennsylvanian Arachnids: a, Scorpion, Eoscorpius carbonarius (Meek 

 and Worthen); b, Spider, Anthrolycosa antiqua (Beecher). (From Le 

 Conte's "Geology," permission of D. Appleton and Company.) 



