6o 



THE APODID^ 



PART I 



which might have been expected, when we take into 

 account the transformations which have developed 

 the latter out of parapodia. It will not be necessary 

 to describe the muscles of the more distal parts of 

 the limbs ; we must confine ourselves to those which 

 move the limbs on the body, and endeavour to show 



ABC 



FIG. 15. Tangential sections through three segments pissing between the longi- 

 tudinal muscle bands and the lateral body wall, diagrammatic, the plane of 

 the section passes through the points a and b in Fig. 14, A to show the 

 circular musculature ; B to show the arrangement of the longitudinal muscu- 

 lature ; C to show the crossing of the longitudinal muscle bands. 



how they have arisen as simple modifications of the 

 original dermo-muscular tube. 



In the first place, we find that the muscles of the 

 limbs have for the most part the same character as 

 those of the trunk, i.e., they are bands with broad 



