pore of coelom I 



coelom I 



glandular area 

 of protosome, 



pericardium 

 central sinus 

 pigmented bond' 



mouth 



midline septum 



B 



Figure 1-14. Anatomical details of Rhobc^op/euro. A, sagittal section of body and coenecium; 

 B, sagittal section of area of attachment to stolon; C, anterior view of protosome and lophophore; 

 D, cross section through metasome; E, cross section through stolon; F, cross section of stomochord. 



THE PROTOCHORDATES • 15 



