412 CELLEPORIDtE. 



rib on the front inclosing an area which is either pnnc- 



tured or furrowed^ the margin of the aperture thickened. 



Polypide large, of a reddish colour, with about 14 tentacles. 



Colonies forming rather thick crusts, composed of several 



layers of cells, placed one upon the other. 



Var. « [tabulosa) . Peristome much raised, forming a sub- 

 erect tubular neck to the cell, with a groove-like depres- 

 sion at the base of it. [Plate LV, fig, 13.] 



Habitat. Ou stones and shells, and on the stems of Algse, 

 Sertularians, and other zoophytes &c., from shallow (Lami- 

 narian region) to moderately deep Avater (36 fathoms) . 



Localities. Lulworth; Cornwall, on stones, 30 fathoms ; 

 Mount^s Bay, on tangle ; South Devon ; Ilfracombe, off 

 the Capstone ; Isle of Man, Ramsay and Point of Ayr ; 

 Guernsey (T, H,) : Ayrshire, on Patella carulea (Landsb.) : 

 Shetland, rocks and roots of LaminaricB -, the Minch (A. 

 M. N.) : Dublin Bay? (Hassall) : S.E, by E, from Barn- 

 borough, 3G fathoms (Kirchenpauer) : between tide-marks, 

 on LammaricB, &c,, Bamborough (Alder) : Peterhead and 

 Wick, plentiful between tide-marks (C. W. P.) . 



Geographical Distribution. Madeira, without punc- 

 tures on the ovicell (J, Y. J.) : Bahusia, North Sea, a single 

 colony on an Alga (Loven) : Bergen (A. M. N.) : Houge- 

 sund, 5-20 fathoms (Kirchenpauer) : France, S.W. 

 (Fischer): Naples; Red Sea (Waters). 



Range in Time. Italian Pliocene (Manzoni). 



The marginal cells of the primitive layer, which can be 

 well seen in specimens spreading over stone, are com- 

 pletely decumbent, and of a regularly ovate form. In old 

 colonies, in which several layers are superimposed one 

 upon the other_, and the zooecia are crowded together, they 

 become erect or suberect, the body of the cell is hidden, 

 and only the apertures are visible. The primarv orifice 



