tail 



Fiii. 453. Illustrating the metamorphosis of the tadpole of <_'i\ni<i 



(After Willey.) 

 A. young tadpole just after fixation, seen from the right side the mouth is still in tin* lai \ai position 



ami tlie tail is just beginning to degenerate. B, ymmg li\ei| dona, in which the month is rotated up- 

 wards and the 'tail is reduced toagranular mass. C. yomiff fixed Cifntn, in which the month ha,- at lained 

 the ni>per pole of the animal and in which the tail has disappeared. , anus; at, atriul canal; li.r, 

 bruin-vesicle ; eiutst, endostyle ; ganrj.ad, adult ganglion ; f/.* 1 -*, the first four gill-slits ; hyp, hypophysial 

 canal ; int, intestine ; m, mouth ; mn, chin (mental process) ; n.c, nerve cord ; n.t, nerve tube ; oes, 

 oesophagus; pc, pericardial sac ; pph, peripharyngeal ciliated band; py.g, pyloric gland ; st, stomach. 



623 



