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 



red 



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

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

 papillse ; air. atrial cavity ; cil. gr. ciliated diverticulum, becoming ciliated funnel ; end. 

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

 oral aperture ; red. rectum ; sens. ves. sense-vesicle ; stiff, stigmata ; stol. stolon ; t. tail. 

 (From Korschelt and Heider, after Seeliger.) 



