lOO 



chim;eroid fishes and their development. 



THE RELATION OF THE BLASTODERM AND YOLK AT THIS STAGE. 



As already noted (p. 38), the egg of Chimaera has by this time undergone a 

 process of fragmentation. The bulk of the egg subdivides in the direction of pro- 

 ducing for the embryo nutriment to be appropriated via gills and gut; a single mass 



C .-. E 



Figs 76 A-N. — Transverse sections of the embryo shown in plate Vil, fig. 44. 

 "I, Mandibular head cavity ; i>»i, premandibular head cavity. 



