224 YOUNG DOEIDES. 



now and again two rings of cilia. When these 

 organs were about to be put into action, they re- 

 minded me of two circular tubes of gas connected 

 together, and each containing innumerable perfora- 

 tions, which were sometimes suddenly and entirely 

 lit up by a torch being applied to one end. 



The cilia may be distinctly seen to play at a cer- 

 tain point, and then gradually extend round the cir- 

 cumference of the rings. When the whole are in 

 full action their movements are so extremely swift 

 as to appear devoid of r motwn y and thus bear a re- 

 semblance to rings of flame. 



The result of the movements of the cilia was always 

 evident in the vigorous evolutions of the little em- 

 bryos, for the microscope filaments, while in action, 

 caused the animal to roll about in all directions in a 

 confined circle. When this envelope burst, the little 

 nautiline dashed out, and then then it was of little 

 use attempting to get a view of the animal again, so 

 rapid and violent were its movements to and fro, 

 never resting for one instant on any spot, and least 

 of all the spot wished. By the aid of blotting- 

 paper, I sometimes reduced the quantity of water in 

 the watch glass ; and the animal, thus being compelled 

 to confine its evolutions to a narrower stage, was more 

 often within the field of view. 



On visiting the sea-shore shortly after the dis- 

 covery of the egg cluster just described, I perceived 

 attached to numberless stones and large boulders 



