SEX-CHARACTERS ILLUSTRATED 65 



wealth of instances of sex-dimorphism. Male 

 butterflies and moths are often more brilliant 



FIG. 12. The Sea-horse Hippocampus. A male, showing 

 the brood-pouch (B) in which the eggs are carried, the 

 prehensile tail (T), and the rapidly vibrating dorsal 

 fin (DF). 



and decorative than the females, but the 

 reverse is sometimes the case, and, more 

 commonly still, the sexes are similar. The 

 E 



