AND STAR-FISH. 167 



which these sucking feet operate. After a short 

 time, one row after another begin to protrude, like 

 so many white thread -worms, waving to and fro 

 until they come into contact with some foreign body. 

 To this they attach themselves by means of their 

 suckers, and their discovery is an encouragement 

 for hosts of other feet to bend over in the same 



Fig. 90. 



; 



" Five Fingers." 



direction, until they also have gained a foothold. 

 Presently, when a sufficient number have been thrown 

 out, an effort is made, and over goes the body of the 

 star-fish ! The presence of these grooves along the 

 arms is one of the distinctive features of the true 

 star-fishes. To see the star-fish glide, not crawl, 

 over all kinds of uneven surfaces, being unarrested 

 by sloping or even perpendicular rock-walls, one 



