LIST OF ILLUSTRATIONS— Continued. 



Plate IX — Continued. 



Fig. 2. Relative sizes of transformed examples. Xl. 



A. Rana catesbeiana. D. Rana pipiens. G. Hyla pickenngu. 



B. Rana clamata. E. Hyla versicolor. H. Bufo lentigmosus amen- 



C. Rana palustris. F. Rana sylvatica. canus. 



Plate X. — Range of transformation-size. 



1. Bufo lentiginosus americanus. 4. Rana sylvatica. 7. Rana clamata. 



2. Hyla pickeringii. 5. Rana palustris. 8. Rana catesbeiana. 

 3*. Hyla versicolor. 6. Rana pipiens. 



Plate XL— American toad (Bufo lentiginosus americanus). , ,o ior.o xxta 



1. A female toad which was dug out of a sandy-loam bank, March 1^, 1»9». Wide 

 awake when submitted to the temperature of a warm room. XO.75. 



2 The same toad resuming the hibernating attitude when placed out-of-doors m 



a temperature almost freezing. XO.75. Figs. 1 and 2 by S. H. Gage. 



3. A toad in its summer burrow. Photograph by A. A. Allen. 



4. A croaking male partly in the water. Flash-light. 



Plate XIL— American toad (Bufo lentiginosus americanus). , ^ , ^^, . ^ _. 



1. Myriads of transformed toads on the shore of Beebe Lake, ithaca, JN. Y. 



2. Curled egg-strings. 



Plate XIII. 



Peeper (Hyla pickermgii). . t,, u ,• u^ 



1. A croaking male. Note mosqmto on his leg. Hash-light. 



2. Same individual as in figure 1. Flash-Ught. ,. , n t> r. u 



3. An adult peeper. Note cross on the back. Photograph by C. R. Crosby. 



4! Mated pair. Axillary amplexation. Xl.5. r^ 1 ^ v^i 



5. A series of peepers from tadpole to transformed peeper. Dorsal aspect. XL 

 American toad (Bufo lentiginosus americanus). 



6. Mating mass of toads. Photograph by A. A. Alien. , ^,t 



7. Series of toads from tadpole to transformed toad. Dorsal aspect. XL 



. Plate XIV.— Tree-toad (Hyla versicolor). 



1. A typical place for the breeding of tree-toads. 



2. A male tree-toad croaking. Flash-light. 



3 A male tree-toad hit on the head by hot flash-light powder. 



4 Egg-packet of tree-toad eggs attached to Potamogeton leaves. 



5. A series of tree-toads from tadpole to transformed tree-toad. Dorsal aspect. XL 



Plate XV.— Leopard- or meadow-frog (Rana pipiens). 



1 An area of egg-masses. Fourteen masses in the illustration. 



2. A stick with three egg-masses, the two upper globular masses being ot Rana 



palustris, the lower plinth-like mass, Rana pipiens. . v,. 



3. Meadow-frogs from tadpole to transformation. Dorsal aspect. XL 



Plate XVL— Pickerel-frog (Rana palustris). 



1. An egg-area and one mated pair. p ., , j t^i i, i- i,* 



2 A croaking male showing vocal sac on either side of the head. Flash-light. 

 3, Pickerel-frogs from tadpole to transformation. Dorsal aspect. XL 



Plate XVII. —Green-frog (Rana clamata). 



1. Mated pair. Pectoral amplexation. 



2. Two detached portions of an egg-film. Wind or current often separates the 



one film into several. 



3. An egg-film (at surface) near the shore among grass. 



Plate XVIIL— Green-frog (Rana clamata). A series from first season's tadpole to trans- 

 formed green-frog. Dorsal aspect. XL 

 Plate XIX —Bullfrog (Rana catesbeiana). A series from the first season's tadpole (three 

 . ^^^^^.^g'jjij) to the transformed bullfrog. Dorsal aspect. XL 



Plate XX. ^ catesbeiana). An egg-film, U feet in diameter. 



2. Wood-frog (Rana sylvatica).. The egg-mass of the wood-frog compared with 

 that of the leopard-frog (at right). 



Plate XXL— Wood-frog (Rana sylvatica). , , ^ . , , , 



1 An egg-area in a pond filled with dead sticks and leaves, 



li^STwo&ogs from tadpole to transformed wood-frog. Dorsal 

 aspect. XL 

 Text-piox;ke 1- ^t^^^^eggs. X4. _.^ ^^^^^^^.^^^^ 



americanus D. Rana clamata. G. Rana pipiens. 



B. Rana pSris. E. Hyla versicolor. H. Rana sylvatica. 



