



:\ 



m 





15 



Kl 



III 



FlG. 314. Ratta temporaria. Metamorphosis of a frog. 1, tadpole just emerged from the 

 egg, dorsal aspect; 2, 3, successively older tadpoles, later aspect; 4, slightly older, dorsal 

 aspect; 5, still older, ventral aspect; 6, gills completely covered by membrane, leaving a 



external opening on the left side; 7, first indication of hind legs; 8 and 10, su< 

 sively older stages; 9, about the same age as 10, with ventral body wall removed, showing 

 gills, front legs, and coiled intestine; 11, with both pairs of legs free; 12 and 13, succes 



ss in the absorption of the tail ; 14, tail completely absorbed ; 15, adult frog. A, anus ; 

 HE, hind leg; A", gills; KL, gill opening; M, mouth; X, nasal opening; <>, eye; SN, 

 sucker. (Photographed from a Leuckart-Nitsche wall chart, by the author; permission 

 of Dr. C. Chun.) 



