292 



ZOOLOGY 





/i.l sti^ ervd 





Fic. 275. — Diagram of the metamorphosis of the free, tailed larva into the 

 fixed Tunicate. .1, stage of free-swimming larva ; B, recently fixed larva ; 

 C, older fixed stage; adli, papillae for adhesion to the rock; atr, "atrial" 

 cavity ; cU.gr, ciliated groove on wall of pharynx ; en(}, glandular groove 

 in pharynx; hi, heart; med, ganglion of heart; njj)i, brain; nolo, noto- 

 chord ; or, mouth; n^ct, rertum ; scns.ves, sense space; stig, throat 

 (gill) slits ; alol, shoot from which buds arise ; /, tail. From Korschelt and 

 H eider. 



