jf^fomJiJ^.miiKsMxi. 



Fi0.1. 



Fvg.Z 



Fi0.3. 



Larval Tunicate 



(Early stage.) 

 Ancestral Chordate 



Early sta^e of 

 Epipliysis m 

 Bufo Cmerea. 



,«5v Somev/liat later 



sta^e m Epiplrysis of 

 Bufo. 



Early stage, all lii^her 

 Cliordata. 



Early stage Chordata, 



Permanent m Cycle dus, 



and Elasmo'branclis. 



Early stage m Anura 



Lacertila and Aves. 



Permanent m Chameleo. 



» » » • • » • • » •W\*v5:>^ -■'-l-LJ. LJ_LJ_LJ_i_L-U->' 



Living, Lacertilia. 

 L alsyrintlio d onta. 

 Ancestors of Rep till a 3t Aves. 



Many Lacertilia. 

 (Calotes. Seps. 

 Leiodera etc.] 



Anura. 



(Adult.) 



Fi0.II. Fig.IZ. 



Certain Lacertilia. 

 (Ceratophora ) 



Aves 

 'Adult. 



Mammalia. 



(Aauit.l 



DIAGRAM ILLUSTRATING THE DEVELOPMENT OF THE EPIPHYSIS. 



yHutK.Lith'Edm'- 



