294 



PALAEONTOLOGY. 



" The indications which the English eocene turtles, in con- 

 junction with other organic remains from the same formation, 

 afford of the warmer climate of the latitude in which they 

 lived, as compared with that which prevails there in the 

 present day, accord with those which all the organic remains 

 of the oldest tertiary deposits have hitherto yielded in 

 reference to this interesting point."* 



Second Order. SAURIA. May be regarded as the true 

 type of the Reptilian Class. They have an elongated body, 

 with four extremities, which are generally directed outwards. 

 Their feet are well developed, and there are in general five toes 

 armed with claws. The number of the spinal vertebrse varies 

 much. The body of each bone in existing families is concave 

 before, and convex behind ; the ribs are always present, and 

 are united to a sternum; they encircle the organs of the 

 abdomen, as well as those of the chest. The shoulders are 



FIG. 199. The Crocodile of the Nile. (Crocodilus vulgaris.) 



formed of three pairs of bones, the scapula, the clavicles, and 

 the coracoids, articulated together to form an arch, which sur- 



* PalseonLographical Monograph, page 44. 



