40 



MR. L. A. BORRADAILE ON THE 



text-fig. 8), and in the hinder part of the head of all groups. 

 Whether it was biramous, like most parapodia, the limbs of the 

 Trilobita *, and many of those of the higher Crustacea, is another 

 question. In the majority of biramous crustacean limbs the 



Text-figure 1. 



Text-figure 2. 



Par#i3odium of Eunice maxima, Hypothetical limb of 

 after Ehleis. pi-oto-phyllopod. 



Fov lettering see p. 71. 

 Text-fioiu^e 3. 



(rap.) 



fll 



Tenth thoracic limb of Apus sp. 

 For lettering see p. 71. 



protopodite and endopodite form an axis to which the exopodite 

 is appended, while the trunk -limb of the Branchiopoda is so 

 clearly unii^amous that there is discussion as to which of its 



* But see footnote to p. 48. 



