PLATE 83 B. 



P.ge 

 Fig. 1. EURYPTERUS PU8TUL08U8. 413* 



1. The R|»cci)nen, natural size. 



Fig. 2. EuRVPTERUS REM1PE8. 404* 



2. The carapace and three articulations of the body of K. remijies, for comparison with the 



form of carapace of E. lacustris on same plate. 



Fig. 3. EURYPTERUS LACUSTRIS. 407* 



3. The carapace of a large individual, showing the form to he distinct from flg. 2, which is 



the carapace of E. remipes. 



Fig. 4. Pterygotus cobbi. 417* 



4. The free ramus of the chelate appendage of this species. 



