3 3 



4 4 



FIGS. I~3. STAGES IN THE DEVELOPMENT OF A 



DOG-FISH (after Bashford Dean), fig. 4. the 

 YOUNG gymnarchus (after Bitdgett). 



In all these the young and growing fish derives its nourishment 

 from an enormous store of yolk attached to the under surface of 

 the body, and serving as an anchor. No food is taken in by the 

 mouth till all the yolk has been absorbed. 



208I 



