198 



PLATE II. 



Figures all twice the natural size. 



Figure 7. Sternum and shoulder-girdle of the Frog, Rana, Os., omosternum ; 



St., sternum ; er., coracoid ; cl., clavicle ; ec, epicoracoid ; «c., scapula ; 



h., humerus. 

 Figure 8. Sternum and shoulder-girdle of Toad, Bufo. Letters with the same 



significance as in Fig. 7. 

 Figure 9. Upper view of head of Black-racer, Bascanion constrictor. 

 Figure 10. Side view of same head. Numerals with same significance in both 



figures. 1, vertical plate; 2, occipital plates; 3, superciliaries ; 4, 



the postfrontals ; 5, the prefrontals ; 6, the anteorbitals ; 7, theloral; 



8, the postorbitals ; 9, the rostral ; 10, the upper and lower labials ; 



11, the temporal ; 12, the nasals. 



