ISS 



THE APODID/E 



PART ll 



THE LIMBS. 



As already stated (p. 179) we find that the differ- 

 ences between the limbs of Apus and of Limulus are 



FIG. 43. Ventral surface of Lininlus moluccanus 9 (after Van der Hceven), showing 

 the ventral parapodia of five pairs of limbs, viz., the second, third, fourth, fifth, 

 and sixth (first trunk limb), working between the prostomium and the under 

 lip ; also the differentiation of the sixth, or fir.st trunk limb, for locomotory 

 purposes. 



as significant as are the likenesses. First as to number, 

 we need only repeat what was said about the difference 

 in number of the segments ; instead of a large number 

 of segments with a large number of limbs at different 

 stages of development, from the parapodium-like limb 



