SECTION XV 



ON THE NEW CLASSIFICATION OF THE CRUSTACEA 

 NECESSITATED BY THE THEORY 



OUR work is so far finished. We endeavoured first 

 of all to show that Apus was easily derivable from a 

 bent carnivorous Annelid. If this was really the case, 

 we at first concluded that Apus must be the primi- 

 tive Crustacean. In order to test this, we appealed 

 to such an archaic form as Limulus, which is still 

 extant, and to the palaeozoic Trilobites and Eury- 

 pteridae. These have offered unexpected confirmation 

 of our theory, amounting, as we have said above, to 

 a demonstration. But at the same time we have had 

 to modify our conclusion that Apus was the primitive 

 Crustacean, these forms not being derivable from 

 Apus, but rather from the same bent Annelids. 

 This accounts, at the same time, for their remarkable 

 resemblances and for their many differences. 



Besides the palaeozoic Crustacea which we have 

 so far mentioned, viz. the Trilobites, Xiphosuridae, 



