VI. 



THE COMMON FROG. 



6i 



appendages. Now both layers of the skin of the 

 common Frog are entirely soft and utterly destitute 



f'lG. 26. — Dorsal surface of the Carapace of a Fresh-water Tortoise (Emys). 1— ^ 

 expanded neutral spines ; r^— rS, expanded ribs ; nu, first median (or nuchaJ) 

 plate ; Py, last median (or pygal) plate ; m, marginal scutes. The dark lines 

 indicate the limits of the plates of the homy epidermal lortoise-shell ; the thiu 

 sutures indicate the lines at the junction of the bony scutes. 



Fig. 27. —DACtylethra c zpensis^ 



