PLATE 2 



EXPLANATION OF FIGURES 



7 Chrysemys marginata, 9.5 mm., H. E. C. 1073. Wax model of the pharynx 

 and aortic arches. Ventral view X 60. 



8 Chrysemys picta, 9.5 mm., H. E. C. 2145. Wax model of the posterior 

 portion of the pharynx, to show the third, fourth, and fifth pouches and the 

 postbranchial body. X 65. 



9 Chrysemys marginata, 10.6 mm., H. E. C. 1087. Wax model of the complex 

 derived from the third pharyngeal pouch. X 60. 



10 Chry.semys marginata, 10.6 mm., H. E. C. 1087. The same embryo as in 

 fig. 9. Wax model of the complex derived from the fourth and fifth pouches and 

 the postbranchial body. X 85. 



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