100 



CHIM^EROID FISHES AND THEIR DEVELOPMENT. 



THE RELATION OF THE BLASTODERM AND YOLK AT THIS STAGE. 



As already noted (p. 58), 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 



Fig*- 76 A-N. Transverse sections of the embryo shown in plate VII, fig. 44. 

 Wl, Mandibular head cavity ; /"'* , premandibular head cavity. 



