THE ZOOPHYTES. 157 



It inhabits deep water, and is but rarely obtained with 

 living polypes, except when dredged up, attached to 

 shells or stones. 



Flustra truncata. Frequently mixed with the above species, 

 which, in general appearance, it much resembles, but is 

 narrower, and the tips of the fronds appear as if cut 

 straight off. Affects the same situations as the common 

 kind. 



Flustra avicularis (Bird's-head Horn-wrack). An interesting 

 species, furnished with numerous appendages, closely 

 resembling the head and bill of a bird ; and commonly 

 found growing on the Flustra foliacea. The aid of a mi- 

 croscope is required to see the construction of the various 

 parts, which well repay a close examination. Not abund- 

 ant, but may frequently be met with on other flustra, 

 corallines, and shells, from deep water. 



Flustra membranacea. Often found coating sea-weed, shells, 

 and other zoophytes. It forms a thin crust which, when 

 dry, readily crumbles to powder. 



Salicornaria farciminoides (Bugle Coralline). After tempestu- 

 ous weather this beautiful species is to be found in 

 considerable abundance, mixed up in^the bundles of 

 zoophytes that are left by the retreating tide. It is one 

 of our most elegant corallines, and seems more local than 

 some kinds; it attains two or three inches in height, 

 and often occurs on oyster and scallop shells; is an 

 inhabitant of deep water, and is at times faintly tinted 

 with rose or purple colour. 



