CRUSTACEA OF THE DEEP SEA 135 



closely resemble in the arrangement of the grooves 

 upon the carapace the extinct Prosoponidse, which 



FIG. 47 Eryon propinquus, ONE OF THE FOSSIL ERYONIDEA, FROM 

 THE JURASSIC ROCKS OF SOLENHOFEN. (From Lankester's 

 " Treatise on Zoology," after Oppel.) 



are known as fossils from Jurassic and Cretaceous 

 rocks. 



