SECTION IV 

 THE MUSCULATURE 



THE musculature of the Apodid?e is so essentially 

 Annelidan in its arrangement, showing only such 

 differentiations as we should expect would arise from 

 the modification of the body already described, i.e., 

 the bending of the head, that were there no other 

 resemblance between the Apodidae and the Annelida, 

 it alone would be almost sufficient to establish their 

 relationship. 



It may perhaps be interesting to mention that it 

 was the Annelidan character of the musculature of 

 Apus which first attracted our attention, and led to 

 the discovery of the other homologies recorded in this 

 volume. 



Anteriorly, where the body has been apparently 

 most modified, we should naturally expect that the 

 Annelidan character of the musculature would be 

 least recognisable. This, however, is hardly the case, 

 for just as the head of the Apodidae can be traced to 

 the anterior segments of an Annelid fixed in the 



