PHYLACTELLA LABROSA. 357 



Phylactella labrosa. Busk. 



Plate XLIII. figs. 1, 2. 



Leprai.ia labrosa, Busk, B.M. Cat. ii. 82, pi. xcii. figs. 1-3: Hincks, 

 Dev. Cat., Ann. N. H. ser. 3, ix. 204 (44 sep.): Norman, 

 Shetland Polyz., Rep. Brit. Assoc. 1868, 308. 



AiiY.siDOTA LABROSA, Busk, Crag Polyz. 26, pi. xxii. fig. 7. 



Phylactella labrosa, Hincks, Ann. N. H. Feb. 1879, 161. 



Zooecia ovate, distinct, disposed in lines, punctured over 

 the entire surface; orifice almost semicircular, with a 

 square-topped tooth on the lower margin, and on each 

 side of it a minute, sharply-pointed denticle ; peristome 

 much elevated, thickened, expanded, forming a wall 

 round the front and sides of the mouth. Ooecia small, 

 rounded, broader than long, recumbent, punctured. 



Primary cell small, ovate, perfectly smooth ; aperture or- 

 bicular, with a smooth, flat border in front, and sur- 

 rounded by a few rather tall and slender spines. 



Colonies consisting of single or double series of cells, 

 branching irregularly from a common centre, where a 

 number are massed together. 



'O^ 



Habitat. Usually on old shells, from rather deep water. 



Localities. Off the Copeland Islands, Belfast Bay, deep 

 water (W. T.) : Antrim, deep water, rather plentiful 

 (Hyndman) : Shetland, scarce, 40 fathoms (A. M. N.) : 

 Oban; South Devon, not common (T. H.) : Hastings 

 (Miss Jelly) : Wick ; Cornwall, off Fowey, and 5 miles 

 off the Deadman (C. W. P.). 



Distribution in Time. Red Crag, on shell (Searles 

 Wood) . 



There is little variability in this very pretty species ; the 

 characters are marked and stable. The surface of both 

 the cell and ovicell is thickly and regularly punctured. 



