422 THE WONDER OF LIFE 



ventured, that the maternal care is in certain respects like 

 an external continuation of the internal organic linkage. 



Paternal Care. Some of the backboneless animals 

 which show parental care are hermaphrodites. This is 

 true of the brook-leech (Clepsine), which carries about its 

 young ones on the under surface of its body. In other 

 cases, both of high and low degree, the parental care is 



FIG. 65. Sea Horses, Hippocampus. The upper row shows the success- 

 ive 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.) 



exhibited by the males. We find this among those inter- 

 esting animals, of uncertain zoological position, known as 

 sea-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 sea- weed, or the sea-horse (Hippocampus), who 



