444 



CHORDATA 



A 



B 



9 



FIG. 497. Oikoplcura cophocerca (after Fol.). A, the whole animal, removed 

 from its 'house,' dorsal view; B, bodv, side view with base of tail, a, anus; c, noto- 

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

 g, g', brain and first ganglion of tail; h, testis; m, mouth; o, ov, ovary; s, gill slits. 



B 



FIG. 498. dona 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; 

 cl, cloaca; d, rectum; e, atrial opening; en, endostyle ending above in the peripharyngeal 

 band; g, ganglion; h, mouth of the 'hypophysis'; he, heart, with pericardium; ho, 

 branched testes; /, oral opening; .k, gill sac; m, muscular sac; oe, oesophagus; od, ovi- 

 duct, the black line beside it the vas deferens; m>, ovary; s, partition between atrium 

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



