162 ZOOLOGICAL PHILOSOPHY 



them that we find lungs for the first time, and we know that it is the 

 most perfect respiratory organ since it is the same as that of man ; 

 but it is still only rudimentary and indeed some reptiles do not have 

 it in early life : as a matter of fact they only breathe incompletely, 

 for it is only a part of the blood that passes through the lung. 



It is also among them that for the first time we distinctly see the 

 four limbs, which are included in the plan of the vertebrates and are 

 appendages of the skeleton. 



TABLE OF REPTILES, 



Order L — Batbachian Reptiles [Amphibians. H. E.]. 



Heart vdth one auricle : skin naked : two or four legs : gills during 



Order 2. — Ophidian Reptiles (or Snakes). 



[Snakes and Apodal Lizards. H. E.] 



Heart with one auricle : elongated narrow body without legs or fins : 



no eyelids. 



Homoderms. 



Order 3. — Saurian Reptiles. 



[Legged Lizards and- Crocodiles. H. E.] 



Double-auricled heart ; body scaly and having four legs ; claws on the 



digits ; teeth in the jaws. 



Tereticavds [Round-tailed. H. E.]. 

 Chalcides. Agama. 



Scincus. Lacerta. 



Gecko. Iguana. 



Anolis. Stellio. 



Dragon. Chamaeleon. 



