NATURAL HISTORY STUDIES 



spiders or Pycnogonids, where the males carry the 

 eggs attached to two of their legs. We find it in 

 several fishes, such as the stickleback, who makes 

 and guards the nest among the seaweed, or the 



Sea-Horses, Hippocampus. The upper row shows the succes- 

 sive positions of the body in swimming. The body bends 

 forwards and straightens again. The lower row shows the 

 fishes at rest. (After Anthony and Chevroton.) 



sea-horse, who carries the eggs about in his breast- 

 pocket. The same is true of some pipe-fishes. 



Among Amphibians there are many cases parallel 

 to those which occur among fishes. Thus the male 

 nurse-frog, not uncommon in some parts of the 

 Continent, carries the strings of eggs on his back 



