16 



CRINOIDEJ?. 



alternating stroke given by the Medusa to the liquid 

 element, and has the same effect, causing the animal to 

 raise itself from the bottom, and to advance back foremost 

 even more rapidly than the Medusa." I have observed 

 that they effect the movement by advancing the arms 

 alternately, five at a time. The stalked young are not 

 only found on corallines, as Mr. J. V. Thompson sup- 

 posed. Mr. W. Thompson finds them on the leaves of 

 fuci, and remarks that they are very active animals on their 

 pedicles. 



The Rosy Feather-star is found on many parts of the 

 British coast. It was sent to Link by Llwyd from Pen- 

 zance, was found at Milford Haven by Mr. Miller, in 

 Wales by Mr. Adams, and on the west coast of Scotland 

 by our distinguished zoologist, Pennant. I have never 

 heard of its being found on the eastern shores, though in 

 Shetland Mr. Goodsir and I found several in ten fathoms 

 water on Laminarise, the roots of which they were grasp- 

 ing with their dorsal filaments or claws, their arms winding 

 among the branches and twining round them. In the Irish 

 Sea I have often dredged large ones in twenty fathoms" 1 

 water at some distance from land. In Ireland Mr. Ball 

 finds it abundant on the Dublin coast, Mr. J. V. Thomp- 

 son at Cork, and Mr. W. Thompson on the shores of 

 Antrim and Down. Mr. Ball and Mr. William Thomp- 

 son dredged it in company with the stalked young oft' 

 Ireland's Eye, near Dublin, attached to Delesseria san- 

 gumea. A plant of Halidn/s siliquosa brought up by the 

 latter gentleman at the entrance of Strangford Lough in 

 October 1839, had about twenty full-grown Comatulee 

 attached to it. 



Two species of Comatula are given as British in most 

 works on British zooloyv, — the Comatula rosacea, having 1 



