PLATE 11 



EXPLANATION OF FIGURES 



80 to 84 A series of five sections from specimen No. 226. The sections are cut 

 almost transversely to the long axes of the embryos, that is, parallel to the surface 

 of themucosa (see text for descriptions). Figures 80 to 81, X 46; figures 82 to 83 ; 

 X 42; and figure 84, X 37. 



682 



