BRITISH ZOOPHYTES. 239 



Flustra Lacroixii {Savignij), F. distans {Hassall), 

 F. Peachii {R. Q. C), Membranipora reticulum (Reuss), 

 Biflustra Lacroixii (Smitt), Conopeum reticulum {Gray). 



Hab. : Cornwall, South Devon, Ramsay (T. H.), 

 Hastings {Miss Jelly), Tynemouth {Aid.). 



This species spreads in colonies over shells and stones. 

 The cells are oval in shape, with thick margins, placed 

 in somewhat irregular rows, and usually having two 

 triangular openings in the crust of the zoarium between 

 each cell and the one below it. The cells are generally 

 armed with spines, which sometimes number two or 

 three stout ones, and at other times are as many as ten 

 or a dozen, in which case they are shorter and more 

 slender. 



2. M. MONOSTACHYS, Bush 



F. distans (D. L.). 



Hab. : Suffolk coast {Bush), Ilfracombe {T. H,), Yar- 

 mouth (Wigham), Hastings {Miss Jelly). 



This species assumes diff'erent appearances according 

 to the age of the colony, at first branching in single 

 series_, and ultimately increasing in number of rows so 

 as to have the regular colonial appearance. The zooecia 

 are ovate, and have a single erect spine at the bottom 

 of each cell, and also one on each side near the top ; 

 sometimes there is a large and varying number (up to 

 18) of spines distributed round the mai'gin. 



3. M. CATENULAEiA, Jamesoii. 



Tubipora catenularia {Jameson) , T. catenulata {Stew.), 

 Hippothoa catenularia {Flem., Bush, G. J., R. Q. C, 

 D. L., McA.), H. Elliotae {Gray), Pyrifora ramosa 

 {D'Orb.). 



Hab. : Generally distributed (in deep water). 



This species has been called the ''Beaded CorallinOj''^ 



