532 HISTORY OF THE HUMAN BODY 



\ .. 



TNT 



Br, 



FIG. 146. Development of Tunicate from free-swimming larva. [After 

 SEELIGER.] 



p', p, adhesive suckers; Br, brain; C, nerve cord; INT, intestine; H, heart; End, 

 endostyle; St, stolo; n, notochord; my, myotomes; t, tail. The orientation is in- 

 dicated by arrows, which mark the incurrent and excurrent orifices. 



