SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE 



VOL. 35. NO. 3, PL. 2 



Fig. 6 



RigJit femur of 



Aniblystoma tigrinuiii 



(most primitive amphibian) 



Fig. 7 



Right femur of 



Hyla versicolor 



(tree frog) 



Fig. 8 



Riglit femur of Hyla 



arenicolor 



Fig. 9 



Right femur of Hyla 



femoralis 



Fig. 10 



Right femur of Hyla 



evittata 



Fig. 11 



Right femur of Hyla 



cinerea 



Fio. 12 



Right femur of Hyla 



regrilla 



Mm^' 



Fig. 13 



Right femur of Hyla 



squirella 



Fig. 14 



Right femur of H\ la 



gratiosa 



Fig. 15 



Right femur of 



Dendrobates tinctoriua 



Fig. 16 



Right femur of 



Leptodactylus albilabris 



Fig. 17 



Right femur of Chorophilus 



feriarum 



Fig. 18 



Right femur of Acris 



gryllus 



Fig. 19 



Right femur of Raiia 



catesbiana 



Fig. 20 



Right femur of Rana 



paUistria 



FiQ. 21 



Right femur of Rana 



areolata circulosa 



Fig. 22 



Right femur of Rana 

 aurora 



m?^ 



^'^^-i»^ 



Fig. 23 



Right femur of Rana 

 pretiosa 



Fig. 24 



Right femur of Rana 



draytonii 



Fig. 25 



Right femur of 

 Spelerpes ruber 



'^^>" 



Fig. 26 

 Right femur of Crypto- 

 branchus allegheniensis 



Fig. 27 



Right femur of Necturus 



maculatus 



Fig. 28 



Right femur of Scaphiopus 



holbrookii 



Fig. 29 



Right femur of Scaphiopus 

 couchii 



Fig. 30 



Right fennir of Scaphiopiis 



hamrrondii 



AMPHIBIANS 



17 



