U. S. B. F.— Doc. 883. 



Plate XX. 



FIGS. 1 TO 11.— MATURE TADPOLES, NATURAL SIZES. 



, 2-year-old bullfro? tadpole; 2, 3 to 5 months old bullfrog tadpole; 3, 1 -year-old bull- 

 frog tadpole; 4, leopard-frog tadpole; 5, 1 -year-old green-frog tadpole; 6, pickerel-frog 

 tadpole; 7, 3 to 6 months old green -frog tadpole; 8, tree-toad tadpole; 9, peeper tadpole; 

 10, wood-frog tadpole; 11, common toad tadpcle. f After Wright, Carnegie Publ. No. 197.) 



