SECT, xv CLASSIFICATION OF CRUSTACKA 



255 



From the Trilobitcs, however, we arc inclined to 

 deduce at least a part of one important group of 

 modern Crustacea, the Ostracoda. "\Yc think it 



Limiting Ostracoda Cirripedia Copepoda si pus Phyl'opoda Malactistraca 



Crustacean -Inn el id 



Ceratiocaris 



Hy rnenocaris 

 adult 



EnrypUridtz Jfl 



Pruposecl genealogy of ihe Crustacea. It will be seen from the text that though we 

 have here given only one root for the Ostracoda it is probable that they have 

 had at least a twofold origin. 



probable that the Crustaceans in question may be 

 deduced both from Trilobitcs and Phyllopods. The 

 strong likeness between these early forms, especially in 

 their larval stages, now perpetuated in the Ostracoda, 



