412 CELLEPORID.E. 



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

 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. a. (tubulosa) . 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. On stones and shells, and on the stems of Algae, 

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

 narian region) to moderately deep water (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 canrulea (Landsb.) : 

 Shetland, rocks and roots of Laminaria ; the Minch (A. 

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

 borough, 36 fathoms (Kirchenpauer) : between tide-marks, 

 on LaminarifB, &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 primary orifice 



