mouth 



ventral 

 blood 



anterior nerve 

 epidermis 



tunic 

 brain (cerebral ganglion) 

 pigment cells 

 neural gland 



dorsal cord 



,a trio pore 



dorsal cord 



dorsal blood sinus 



trabecule 

 languet 



connecting vessel 



ciliary band 



marginal bond 



lateral bands 

 median band 



dorsal cord 

 ciliated groove 

 mesenchymatous septa 



■epicordium 

 heart in pericardium 



Figure 1-8. Anatomy of C/ovelino iepodiformis. A, sogittal section of body and stolons; B, cross 

 section of stolon; C, sagittal section of brom and neural glond; D, cross section of pharynx region 

 with enlarged section of o pharyngeal bar at left and above; E, cross section of body near base. 

 (After Brien, 1948) 



10 • CHORDATES, PROTOCHORDATES, AND THEIR RELATIONSHIPS 



