CORALLINES. 71 



describes one of these tubes as like part of an oat 

 straw with the joints cut off. They are filled with a 

 soft, almost reddish pink pulp ; the polyps project from 

 the open ends of the tube, and are not retractile 



TUBULARIA INDIYISA. 



within them. The body, or naked portion of the 

 polyp, forms a globular knot of a scarlet colour, pro- 

 duced above, into a sort of proboscis, encircled with 

 a series of short arms of the same character. Around 

 the base of this body there is another circle of much 

 longer arms, from thirty to forty in number. The 



