Cerebral 

 vesicle 



Oral cirri 



Velum 



Velar tenta- 

 cles 



Spinal cord 



Atriopore 

 Intestine 



Ventral fin 



Anus 



Caudal fin 



Fig. 214. — Diagram of Branchiostoma (Amphioxus) lanceolatus from the right side 



to show the structure. 



