II. TUNIC ATA: COPELAT^. 



507 



FIG. 544. Oikopleura cophocerca. (After Fol.). A, the whole animal, removed from its 

 'house,' dorsal view; B, body, side view with base of tail. , anus ; c, notochord; 

 a', branchial region ; d", stomach ; en, endostyle ; /, ciliated peripharyngeal 

 bands; 0, g', brain and first ganglion of tail; 7i, testis; m, mouth; o, ov, ovary; 

 s, gill slits. 



B 



FIG. 545. Ciona intestinalis. A, from the left side, the cellulose tunic and dermal 

 muscular sac removed ; B, from the right side, the tunic entirely removed, pharynx 

 opened from the mouth, a, anus ; c, cellulose tunic below with adhesive processes ; 

 d, cloaca; d, rectum; e, atrial opening; en, endostyle ending above in the peri- 

 pharyngeal band; g, ganglion; 7i, mouth of the 'hypophysis'; hr, heart, with peri- 

 cardium ; ho, branched testes ; i. oral opening; /c, gill sac ; m, muscular sac ; oe, 

 oesophagus ; orf, oviduct, the black line beside it the vas deferens ; ov, ovary ; s, 

 partition between atrium and body cavity ; st, stomach ; t, crown of tentacles. 



