394 



MVRIAPODA. 



The arguments which can be urged for the opposite view do not appear 

 to me to have much weight, so that the homology of the appendages in 

 question with the second pair of maxillae may be provisionally assumed. 



The third pair of post-oral appendages of the Chilopoda may probably 

 also be assumed to be equivalent to the second pair of maxillae, though they 

 are limb-like and not connected with the head. The subjoined table shews 

 the probable homologies of the appendages. 



TJie germinal layers and formation of organs. 



The development of the organs of the Myriapoda, and the origin of the 

 germinal layers, are very imperfectly known : Myriapoda appear however 

 to be closely similar to Insects in this part of their development, and the 

 general question of the layers will be treated more fully in connection with 

 that group. 



The greater part of the blastoderm gives rise to the epiblast, which 

 furnishes the skin, nervous system, tracheal system, and the stomodaeum 

 and proctodaeum. 



