DIVISIONS OF REPTILIA. 



239 



thirdly, that the scapular and pelvic arches, supporting respec- 

 tively the fore and hind limbs, are situated within the carapace 

 (Fig. 118, s and p\ so that the shoulder-blade is placed inside 

 the ribs instead of outside, as is usually the case. 



FIG. 118. Skeleton of a Tortoise (Emys Ewropaia\ seen from below, the plastron having: 

 been removed, ca Carapace, showing 1 the flattened and expanded ribs ; s Scapular 

 arch, carrying the fore-limbs, and placed in the interior of the carapace ; p Pelvic arch, 

 carrying the hind-limbs ; r Kibs. 



The Chelonia are conveniently divided into groups, accord- 

 ing as the limbs are adapted for swimming (natatory), or for 

 progression on land (terrestrial) ; or, again, enable the animal 

 to lead an amphibious life, sometimes on land and sometimes 

 in the water. Of the strictly aquatic forms the best known 

 are the edible Green Turtle ( Chelonia midas) and the Hawk's- 

 bill Turtle ( Chelonia imbricata). The former is found abun- 

 dantly in many of the seas of warm climates, and is largely 

 imported into Europe as a delicacy. The latter (Fig. 119) is 

 truly a native of warm seas, though an occasional straggler 

 has reached the shores of Britain. It is of comparatively 

 small size not more than about three feet in length but is 



