36 



ZOOLOGY 



SECT. 



ciliated funnel. The enteric canal is distinguishable into pharynx, 

 oesophagus, stomach, and intestine. The pharynx opens on the 

 exterior by the mouth : in its ventral floor the endostyle (end.) 

 has become developed ; its walls are pierced by stigmata, the 



reel 



FIG. 745. Diagram of the metamorphosis of the free-tailed larva into the fixed Ascidian. A, 

 stage of free-swimming larva ; B, larva recently fixed : C, older fixed stage, adh. adhesive 

 papillae ; air. atrial cavity ; oil. gr. ciliated diverticulum, beconiing ciliated funnel ; end. 

 endostyle ; ht. heart ; med. ganglion of trunk ; n. gn. nerve-ganglion ; noto. notochord ; or. 

 oral aperture ; rect. rectum ; sens. ves. sense-vesicle ; stig. stigmata ; stol. stolon ; (. tail. 

 (From Korschelt and Heider, after Seeliger.) 



