June, 19J1.] CrAMPTOX : Evoi.UTION OF Till-: A NTH ROPnOA. 97 



atomically intcrnictliate l)et\vcen tlie Mysidacea and the Syncarida. 

 and were also in all probability related to the Arthropleura and to 

 Oxyuropoda as well. From this common ancestry arose the higher 

 Crustacea, whose lines of development have paralleled that of insects 

 on one side, and the Symphylo-Pauropoda. whose lines of develop- 

 ment have paralleled that of insects on the other side. The lines of 

 development of the hi},'her Crustacea have accompanied those of the 

 insects much further than the lines of development of the Symphyla, 

 etc.. have, and many crustacean features have even been carried over 

 into the lower representatives of the winged insects. 



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