152 THE BOOK OF NATURE STUDY 



Finally, when searching for skeleton-shrimps among red 

 weed, one may find instead slender spidery animals, with four 

 pairs of walking legs. These are the so-called sea-spiders, 

 interesting because their structure is still something of a 

 puzzle to naturalists, who are not quite sure how they should 

 be classified. They live well in captivity, and some species show 

 an extraordinarily close resemblance to the weed over which 

 they habitually clamber. 





