222 NATURAL HISTORY OF 



(Corall., 38). He describes it as " of a stony, brittle 

 texture, and having angular sides to its cells/' From 

 the latter feature it is called by Dr. Solander the 

 " Stony Angular-celled Coralline. '' Each cell is armed 

 with two spines at the top, a large avicularium at the 

 side, and avibracular cell. The zoophyte forms bushy 

 tufts of a white colour. 



2. S. ELLIPTICA, Reuss. 

 S. inermis {A.M.N.). 



Hab. : The Minch, Hebrides [A. M. N.), Shetland 

 (0. W. P.). 



Described and figured by the Rev. A. M. Norman 

 in the Q. J.M. S., 1868 (N. S.), viii. 215. He describes 

 it as more robust than 8. scruposa, and as being with- 

 out spines. In colour the zoophyte is yellowish. 



With an operculum. 



3. S. scRUPEA, Bush. 



Hab. : Dartmouth {ForheH), St, Ives, Torbay, Guern- 

 sey (T. K), the Minch (A M. K). 



This species was described by Mr. Busk in the 

 Annals of Nat. Hist., ser. 2, vii. 83. 



It grows to a height of | inch, and to the naked eye 

 resembles >S'. scniposa. Each cell is armed with three 

 spines on its outer margin above, and one or more on 

 the inner margin. The operculum is rounded below, 

 pointed at the top, with a lateral projection. There 

 are large lateral avicularia and vibracular cells. 



4. S. SCABRA, Van Ben. 



Sertularia halecina {Fahr.), Flustra scruposa (i''a?>r.), 

 Cellarina scabra {Van Ben.), Cellulaiua scrupea {Aid.), 

 Sertularia scrupea {Bush), S. Delilii {Busk, Aid.), 

 Cellularia scabra {Smitt). 



