1 882.] On the Homologies of the Crustacean Limb. 



less cylindrical epipod: 



shall hardly be doing greater 

 violence to nature than we see 

 to occur in any Decapod, 





x, the maxillae of the lobstei 

 have no specialized exopo 

 dite, suchas is so well 

 in the maxillipedes, and th 

 thoracic legs possess not evei 

 the rudiments. Chang 

 function and radical chani 



the Malacostracous Crustacea, 

 from the Brachyura to the 

 Isopoda and Amphipoda. If "%% 

 so startling in these compara- 

 tively recent forms, it is not 

 to be wondered at that still 

 greater and more fundamental 

 modifications of the Crusta- 

 cean type obtain in the archa- 

 ic forms, the Palaeocarides, of 

 which Limulus is the sole 

 survivor. To those who in- 

 sist on the Arachnidan affini- 

 ties of the Merostomata, we 

 would suggest that tr 

 shifting and change of func- 

 tion and structure is to be ob- 

 served among the Tracheate 

 Arthropoda, and that Limu- 

 hs is not less a w 

 chiate Arthropod for presen 

 lr ig some features analogoi 

 to the Arachnida. 



to confirm 

 expressed , 



