AMPHIBIA 



269 



Reese, A. M. 1906. Anatomy of Cryptobranchus allegheniensis. 



Am. Nat., vol. 40, no. 472, pp. 287-326. 

 Smith, B. G. 191 2. The embryology of Cryptobranchus allegheniensis, 



including comparison with some other vertebrates. Jour. Morph., 



vol. 23, pp. 61-157. 



Fig. 143. Necturus maculosus. (Courtesy of S. C. Bishop.) 



Order 3. Anura (Salientia. Ecaudata). — The Anura (Gr., not, 

 a tail) are highly specialized types, with marked metamorphosis. 

 There are over nine hundred species of frogs and toads in this order. 

 They have nine to ten vertebrae with the coccyx (urostyle). No 

 tail or gills are found in the adult. 



The Surinam toad ( Pipa) lacks a tongue and has a common open- 

 ing for the Eustachian tubes. It is a South American form with 

 peculiar breeding habits. Its mating is such that the long oviducts 



