49 



Order II. SAURIA. — Brogniart. 



CHARACTERS. 



1. The body is elongated, rounded, and covered with plates, or scales, or granu- 



lations, and is destitute of a carapace or shell. 



2. There is always a sternum, and distinct, movable ribs. 



3. The tail is elongated, and the vent commonly transverse. 



4. The extremities are usually four in number. 



5. The eyelids are visible, and so is generally the membrane of the tympanum. 

 C. The mouth is large, and without movable lips. 



7. The rami of the lower jaw are anchylosed at the chin, and are armed with 



teeth. 



8. The heart is composed of two auricles and one ventricle, sometimes subdivided 



by imperfect partitions. 



9. There are two lungs, of nearly equal development, and extending more or less 



into the abdominal cavity. 

 Vol. II.— 7 



