REPTILIA 



143 



FIG. 269. PLAN OF REP- 

 TILIAN CIRCULATION. 

 See arrows. 



How many axial plates ? How many oslal \j"ib) plates ? 



How many border plates. 1 * Which pJates are largest? 



Smallest ? Do the horny plates 



overlap like shingles, or meet edge 



to edge ? Is there any mark wheic 



they meet on the bony shell : 



Basing it upon foregoing facts, 



give a connected and complete de- 

 scription of the structure of the 



carapace. Compare the skeleton 



of the iivrtle with that of the snake, 



r.iid ..jiic <4. L e the differences in 



structure with differences in habits. 

 i>raw the tortoise seen from the 



side or above, with its shell closed, showing the arrange- 

 ment of the plates. 



Place soft or tender vegetable 

 food, lettuce, mushroom, roots, ber- 

 ries, and water, also meat, in reach 

 of the turtle. What does it pre- 

 fer ? How does it eat ? It has no 

 lips ; how does it drink ? 



Study the movements of its eye- 

 balls and eyelids, and the respira- 

 tory and other movements already 

 mentioned. State a reason for 

 thinking that no species of land 

 animals exists that lacks the sim- 

 ple power of righting itself when 



turned on its back. 

 FIG. 270. REPTILIAN VIS- 

 CERA (lizard) . Tortoise, Turtle, Terrapin. The 



/?-, windpipe; h, heart ; /, lungs; turtles belong tO the Order of TCp- 

 Ir, liver: ma, stomach; dd, . . 



^.intestines; hb t bladder. tiles called ckelomans. No one 



