58 



MR. L. A. BORRADAILE ON THE 



the basal joint of the mandible of Malacostraca, corresponds to 

 tlie fused precoxa and coxopodite. Those of Bi'anchiopoda 

 represent the precoxa only, the rest of the limb ha,ving dis- 

 appeared. The basal segment of Copepoda, again, corresponds 

 to no more than the precoxa, the coxopodite being represented 



Text-figure 33. Text-figure 34. 



Text-figure 35. 



Text-figure 36. 



Text-fig. 33. End view of mandible oi Lepidurus sp, 

 „ 34. End view of mandible of Cypris sp. 

 „ 35. End view of mandible of Calanus sp. 

 „ 36. End view of mandible of Lepas sp. 



by the little segment between that which bears the biting-edge 

 and that upon which stand the exopodite and endopodite in 

 Calanus (text-fig. 24). In Ostracoda (text-fig. 25), it would seem, 

 the coxopodite must either have been excalated altogether or 



