5i8 MANUAL OF ELEMENTARY ZOOLOGY 



ii. Sub-class Teleostomi. 



Fishes with bone in the skeleton, an air- 

 bladder not used as a lung, and no 

 internal nares. 

 a. " Ganoid " Orders, 

 e.g. Acipenser. 

 p. Order Teleostei. 



e.g. Salmo, Gadus, Pleuronectes, and 

 most fishes, 

 iii. Sub-class Dipnoi. 



Fishes with bone in the skeleton, internal 

 nares, air-bladders used as lungs, and a 

 tadpole larva, 

 e.g. Lepidosiren. 

 c. Class Amphibia. 



Cold-blooded Vertebrata with pentadactyle 

 limbs, usually no scales, no rays in 

 median fins, lungs, shell-less eggs, no 

 amnion or allantois, and a tadpole 

 larva with gill-clefts which are usually 

 lost in the adult, 

 i. Order Stegocephali. 



Extinct amphibians, with a complete 

 covering of dermal bones on the skull 

 and often a dermal armour on the 

 body. 



e.g. Capitosaurus. 

 ii. Order Gymnophiona. 



Amphibians of worm-like habits, without 

 girdles, limbs, or tail, and with rings of 

 small scales in the dermis, 

 iii. Order Urodela. 



Amphibians with girdles and usually short 

 limbs, with tail and no exoskeleton. 

 e.g. Molge, Salamandra. 

 iv. Order Anura. 



Amphibians with stout bodies, long legs, 

 no tail, and no exoskeleton. 

 e.g. Rami, 

 d. Class Reptilia. 



Cold-blooded Vertebrata with pentadactyle 



