PLATE 9 



EXPLANATION OF FIGURES 



22 Wax plate reconstruction of the left eye-ball and adjacent structures of 

 an embryo Chelydra of 11-mm. Seen from the median side. X 66. On account 

 of the cephalic flexure, when the embryo is in the upright position and viewed 

 from the side, dorsal and ventral, in figures 22 and 23, are as indicated on the 

 plates, D.V. 



182 



