FORM AND LOCOMOTION 



II 



firm, smooth eyes, carefully adjusted so that their surfaces are 

 level with the adjoining surfaces of the head; and the closely 



Fig. 5. DIFFERENCES IN FORM. 



A. Mackerel (Scomber scombrus),X l ; B. Trunk-fish (Ostracion gibbosus),X I ; 

 C. Sun-fish (Mola mola),x4^\ d. Globe-fish {Chilomycterus antennatus),x\ \ 

 E. Sea Horse {Hippocampus punctulatus), x ^ ; f. Common Eel {Avgidlla anguilla). 



fitting gill-covers ; all these are features whose meaning becomes 

 clear when interpreted in terms of rapid progression. The 

 small scales with which the body is covered offer practically 



