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 



ir, windpipe; h, heart; in, lungs; turtles belong to the order of rep- 



Ir, liver: ma, stomach; dd, .. 11 i 7 r • tvt 



md t intestines; Ai, bladder. tiles called ckelonians. No one 



