G50 



COMPARATIVE ANATOMY 



mud-puppies nearly white in color. But, if brought into the light they 

 become at first grayish and then jet-black. 



Typhlomolge rathbuni, is a form quite like Proteus, and is found 

 in subterranean caves and sometimes is brought up from deep artesian 

 wells. They are found in Texas. 



Family IV. Sirenidae. (The Sirens) (Fig. 375). 



These have three pair of permanent fringed external gills, and the 

 body is eel-like. There are no hind limbs. There are two genera each 

 with a single species. 



Siren lacertina, commonly called the "mud-eel." It may reach a 

 length of thirty inches. It is black in color dorsally and lighter ventral- 

 ly. It is found in the southeastern part of the United States. 



Pseudobranchus striatus, is much smaller than Siren, hardly ever 

 reaching a length of more than seven inches. It has one pair of gill- 

 clefts and only three fingers. There is a broad yellow band along each 

 side. It is assigned the lowest place among the urodeles. 



Order III. Anura (Tailless Amphibia) (Figs. 315, 376). 



These are the frogs and toads. 



Sub-Order I. Aglossa. - 



These animals have no tongue. 



This group is not yet commonly known as it occurs only in South 

 America and in Africa. 



Pipa americana (also known as the "Surinam toad," Fig. 376), has 

 rather remarkable methods of carrying its eggs after they have been 

 laid. There are holes in the back of the female into which they are 

 deposited. 



Xenopus, and Hymcnochirus are the African genera. 



Pi/m americana 



Rhacophorus 

 (fti/ing Irce-load of Borneo) 



Atytes obstctricaiis 

 (obstetrical toad) 



Fig. 376. Anura. 



A, Pipa americana with young in skin pockets of. back. C, Male obstetrical 

 toad with string of eggs. (A, after Ludwig ; B, after Wallace; C, after Claus.) 



