PLATE 10 



EXPLANATION OF FIGURES 



(Necturus maculosus) 



The figures are intended to show in particular the late history of the blastopore. 

 P^igures 268 to 27() inclusive were drawn from the living eggs by Prof. Bashford 

 Dean; figures 277 to 279 are from preserved material, and were drawn under the 

 direction of the author by Miss Mabel L. Hedge. 



578 



