6: . REPTILES, AND: BIRDS, 
OPHIDIA. 
_ Having: nimerots ‘vertebrae with single-headed hollow ribs, no 
visible limbs, eyelids covered’ by an immovable transparent lid ; 
body covered by horny scales. It includes :— 
Viperine—thie Vipers and Crotalidz. 
~ fn» Colubrine—the Colubers, Hydride, and Boidie.; 
CROCODILIA. 
*. Yeeth,in a single row, implanted in distinct sockets ; body de- 
pressed, elongated, protected on the back by solid shield; tail 
longer than the trunk, compressed laterally, and furnished with 
crests above.. The several families are :— — 
Crocodilide—the Gavials, Mecistops, Crocodiles. 
Alligatoridez—Jacares, Alligators, Caiman. * 
* By some naturalists the Amphibia are considered as a distinct class, by others 
as a sub-class either of Reptilia or of Prsces. Of the Reptiles proper (at present 
existing), the arrangement into the orders Zestudinata (or Tortoises), Sawria (or 
Lizards), and Op/zadia (or Snakes), is the one most generally adopted ; but De 
Blainville elevates the Zorzcata (or Crocodiles) to the rank of an order, and others 
have adopted a division of corresponding rank. Saurophida, for the Anguis series 
above referred to; but the latter are merely iimbless Lizards (or with abortive 
limbs) akin to the Scinques.-—ED, — 
