BUGULA FLABELLATA. 81 



Localities. A very abundant and widely distributed 

 species. Shetland, 15-50 fms. ; Dourie Voe and haddock- 

 ground, Out-Skerries and Unst (C. W. P.) : St. Andrew's, 

 on Flustra, deep water, rather rare (Dr. M'Intosh) : 

 Northumberland, on Flustra, &c., from the Coralline zone, 

 not rare ; Bamborough, rocks at extreme low-water mark 

 (Alder) ; Peterhead, on Flustra (C. W. P.) : Bootle 

 (Tudor) : Filey ; Isle of Man ; Llandudno, N. W. ; South 

 Devon, common (T. H.) : Guernsey (R. S. Cooper) : 

 Cornwall, deep water, common (Couch), &c. 



Geographical Distribution. Heligoland (Kirchen- 

 pauer) : Ostend (Van Ben.) : Roscoif (JoKet) : Adriatic 

 (Heller and Grube) : Florida, deep water (Pourtales) : 

 Madeira; Cape of Good Hope (Kirchenpauer). 



When dried this species may at once be recognized by 

 its ashy colour. Its habit and mode of growth are also 

 characteristic. "When living it is ''of a very delicate 

 flesh-colour." 



The rows of cells in the strap-like segments which 

 compose the branch vary in number ; they are never, I 

 believe, fewer than four, and range as high as seven. The 

 cell is oblong and rectangular, and of equal width through- 

 out, while the aperture extends to the very bottom of it. 

 In these respects it differs markedly from the previous 

 species. Of the two spines placed at the top of the cell 

 on each side, the higher are comparatively stout and 

 directed upwards, while the lower pair are slender and bend 

 inwards across the aperture. Two of the spines are gene- 

 rally much more fully developed than the others, some- 

 times the upper and sometimes the lower pair being the 

 larger. Along the edge of the segments there are usually 

 three spines near the outer angle of the cell, but never 

 more than two elsewhere. The avicularium does not ex- 



G 



