ORDER AXXULATA SEDENTARIA. 



99 



nibedded in, the rocks. Its irritability is exceedingly- 

 great, and on being approached it instantly retreats into 

 .'ts elastic tube ; this tube is of a leathery consistence, 

 unlike that of the Sernula. Specimens of this elegant 

 species can only be obtained by breaking off such parts 

 of the stone as contain them. These, being put into 

 tubs of sea-water, may be kept for months in perfect 



.\' 





A miili itritc ma<jn 'jlca. 



health. That part of the body which is so beautifully 

 spread out like an umbrella, consists of the branchice, 

 or organs of breathing ; tb.ese are of a yellowish colour, 

 beautifully marked with pink. The Araphitrite, although 

 perhaps it never entirely leaves its tube, is not attached 

 to it, and frequently draws out nearly the whole of its 

 body. 



