224 NATURAL HISTORY OP 



effervescence ensues, till the stony or coral-like coat is 

 destroyed; and tlien the cells, still keeping their shape, 

 appear to be made of a thin pliable membrane like 

 those of the hinges and roots ; so that roots, hinges, 

 and cells appear now to be one continuous tubular 

 membrane, only modified into different shapes.'^ — Ellis. 

 This is one of the most easily identified species, the 

 peculiar-shaped operculum being most prominent, and 

 the entire zoophyte being interesting and beautiful. 



Genus IV. Caberea, Lamouroiix. 

 From Caberea, the daughter of Proteus. 



Zoarium not articulated. Zooecia in two or more 

 series, subquadrangular or ovate, with a very large 

 aperture. Sessile avicularia on the side and front of 

 the cells, the lateral avicularium minute. Vibracular 

 cells very large, placed in two rows, stretching ob- 

 liquely downwards across the back of the zooecia, 

 which they almost cover, to the median line, notched 

 above and traversed through a great portion of their 

 length by a shallow groove. Setoe usually toothed on 

 one side. — T. H. 



1. C. Ellisii, Fleming. 



Flustra Ellisii (Flem.), F. setacea {Flem., G.J.,D.L., 

 De B.), Cellulai'ia Hookeri {O. /., D. L.), Bicellaria 

 Hookeri {De B.), 0. Hookeri [Bush, P. E. G., McA.), 

 Flabellaria setacea {Gray). 



Hab. : In deep water in Shetland, the Minch {A. 

 M. N.), Torquay {Hooker). 



This species grows to the height of 1 inch, and is 

 fan-shaped and yellowish-brown. It appears to be 

 rare, except in the Shetland Seas, in which Norman 

 says it is one of the more common Polyzoa. Dr. 



