REPTILIA 



143 



FIG. 269. PLAN OF REP- 

 TILIAN CIRCULATION. 

 See arrows. 



How many axial plates ? How many costal (rib) plates ? 



How many border plates ? Which plates are largest ? 



Smallest ? Do the horny plates 



overlap like shingles, or meet edge 



to edge ? Is there any mark where 



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 turtle with that of the snake, 



and correlate the differences in 



structure with differences in habits. 

 Draw 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 



lr, windpipe; k, heart ; /, lungs; turtles belong to the Order of TCp- 

 lr, liver; nta t stomach; dd, 



md, intestines; hb t bladder. tiles called chelomans. No one 



