HO MOLOGIES OF CRUSTACEA. 43 



elusions upon the homologies of these species is so unsatisfactory, that 

 all that is here brought forward, may be received as only hints by way 

 of suggestion, and not as well-grounded conclusions. 



The excessive number of joints in the Phyllopoda finds an analogy 

 in the Vennes, and in the larves of Insects, and it is perfectly in har- 

 mony with the law laid down by Prof. Agassiz, who observes that the 

 same peculiarity characterizes the Crustacea of the earliest geo- 

 logical epochs. This peculiarity is evidence of inferiority of grade, 

 such as marks animal life of other kinds in the Palaeozoic period. 



