CHIM^ROID FISHES AND THEIR DEVELOPMENT. 



ffC. Body cavity. 

 9^, J7". Evagination of gut wall to form the 

 Brst and second gill openings. 

 h. Heait. 



EE 



Figs. 73 T-EE — Continued. 



nc. Neutal ciest. 



sn. Subnoiochordal rod. 

 y ■ Yolk lying free in cavity of gut. 



