PLATE 1 



EXPLANATION OF FIGURES 



1 to 6 Wax models of the pharynx and aortic arches in embryos of Chrysemys 

 marginata. Fig. 1, 4.4 mm., H. E. C. 1051; fig. 2, 4.6 mm., H. E. C. 1052; figs. 

 3 and 4, 5.5 mm., H. E. C. 1057; fig. 5, 5.6 mm., H. E. C. 1060; fig. 6, 6.6 mm., 

 H. E. C. 1069. All figures X 60, and are lateral views, except fig. 4, which is a 

 dorsal view. 



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