CRUSTACEA. 11 



second that of the P;ECILopoda, which in the first edition of 

 this work were a mere section of the preceding order. 



The singular fossils called Trilobites, of which M. Brong- 

 niart has given an excellent Monograph, being considered 

 by him, as well as by many other naturalists, as Crustacea al- 

 lied to the Entomostraca, we will briefly speak of them after 

 we have done with the latter. 



