216 HISTORY OF BRITISH ZOOPHYTES. 



placed in a vessel of sea-water, the polypes protrude them- 

 selves amazingly, .and extend their tentacula, which are 

 thick, obtuse, grooved along the centre, and not longer than 

 the diameter of the disc." 



2. A.LCYONIUM GLOMERATUM. 



Hab. Dublin Bay, Hassall; Cornwall, Couch. 



Though, generally speaking, this Alcjjonium is rare, it 

 seems not to be uncommon in Cornwall, so that it is fami- 

 liar to Mr. Couch. A. fine live specimen of it was brought 

 to us by a fisherman, who had obtained it in his net off 

 Saltcoats, and we have seen another live specimen in the 

 possession of Major Martin, dredged at Cumbraes, and kept 

 for weeks ahve in sea-water in a glass vessel. It difi'ers 

 from the preceding one strikingly in colour, which is bright 

 red. 



Genus XXII. SARCODICTYON, E. Forbes. 



Gen, CJiar. Polypidom incrusting, linear, creeping, anastomos- 

 ing at intervals, so as to form a sort of network. Polypes dis- 

 tant, in uniserial prominent cells ; the tentacula eight, and pin- 

 nated. — Jolmston. 



1. Sarcodictyon catenata. 



Hab. Youghall, R. Ball ; Loclifine, and in several loca- 



