SECT, in THE APPENDAGES 31 



five bent segments thus offers a clear solution of 

 the difficult morphological problem involved in the 

 prostomial position of these appendages. 



(3) As to the great number of the limbs, remind- 

 ing us of the row of parapodia on each side of the 

 Polychaetan Annelids, we need only refer to what 

 was said in the previous section as to the great 

 number of the segments (pp. 1 6- 1 8). 



(4) The marked difference between the head- and 

 the trunk-limbs will be presently discussed in detail, 

 and the differences shown to be exactly what our 

 theory demands. In the meantime we find a gradual 

 change in the trunk limbs as we go from front to back. 

 Though the Phyllopodan type is preserved through- 

 out, the anterior limbs (except the first, which is 

 specialised) are highly developed seizing limbs, the 

 posterior are simplified as rowing plates. There 

 can be no doubt that the more rudimentary limbs, 

 though necessarily repeating the type of those 

 previously developed in front of them, partake more 

 of the character of an integumental fold, like an 

 Annelidan parapodium, than do the anterior limbs 

 with their developed shafts, claws, &c. (cf. Figs. 4, 5, 

 and 10). 



(5) On placing a typical Phyllopodan limb by the 

 side of a typical Annelidan parapodium, the homo- 

 logies of some of the parts are very clear. As, 

 however, the establishment of the homologies in detail 

 is not so easy, we shall, in this place, have to content 

 ourselves with merely stating our conclusions. The 

 reasons which led to these conclusions, apart from 



