172 REPTILIA (the turtle) 



(d) How many ribs? 



(e) How many ribs and bony plates united? Why? 



(f) How do the bony plates compare with the epidermal 



plates in size, shape, number, and arrangement? 



(g) Of what does the carapace consist? 

 (h) Use of this complicated structure? 

 (i) The Plastron. 



(1) Sketch it. 



(2) How many epidermal plates? Color? 



(3) How many bony plates? 



(4) Compare the plastron with the carapace as to 



shape, size, and relation to other parts. 



