286 Z. ASCIDIOIDA. Flustra. 



Vers, iii. 141. Corall. 45. Flem. Brit. Anim. 535. Hogg's Stock. 36. 

 Grant in Edin. New Phil. Jouin. iii, 111. Stark, Elem. ii. 437. John- 

 ston in Trans. Newc Soc. ii. 264, pi. 9, fig. 4. Templeton ut. sup. cit. 

 469. Roget, Bridgew. Treat- i. 165, fig. 63, 64; and 172, fig. 69, 70. 

 Dalyellin Edin. New Phil. Journ. xvii. 413; and in Rep. Brit. Assoc. 



an. 1834, 60-3 La F. voile, Blainv. Actinolog. 451. 



Hab. On shells from deep water. From Aberdeen, Skene. 

 Leith shore, Mr Parsons. Not unfrequent at Seaton, Hartlepool, 

 Whitburn, and other places on the coast of Durham, J. Hogg. Coast 

 of Berwickshire, not uncommon, G. J. Ireland, Templeton. 



Polypidom frondose, fixed by a small disk, narrow at the base with 

 thickened margins, dilating- upwards and becoming very broad in 

 proportion to the height, which at most is about two inches, thin, 

 yellowish brown, deeply divided, the segments broad and somewhat 

 rounded on the apex. Cells on one side only, large, and smooth. 

 Polypes with about 22 tentacula, which are " nearly a third of the 

 length of the body, and there appear to be about 50 cilise on each 

 side of a tentaculum, making 2200 cilise on each polypus. In this 

 species there are more than 18 cells in a square line, or 1800 in a 

 square inch of surface, and the branches of an ordinary specimen pre- 

 sent about 10 square inches of surface ; so that a common specimen 

 of the F. carbasea presents more than 18,000 polypi, 396,000 tenta- 

 cula, and 39,600,000 cilise." Grant. 



5. F. SETACEA, cells in 2 or 3 rows, oval, with a setaceous 



bristle. Rev. Dr Fleming. 



Flustra Ellisii, Fleming in Wern. Mem. ii. 251, pi. 17, fig- 1 — 3 



F. setacea, F/em. Brit. Anim. 536. La F. setacee, Blainv. Actinolog. 



451. 

 Hah. " Along with Cellepora cervicornis, from deep water, Zet- 

 land," Dr Fleming. 



" Height nearly two inches ; branches linear, not the tenth of an 

 inch in diameter ; substance firm, brittle ; the base consists of small 

 tubes, which by their union, form the branches, dorsally carinated 

 by the union of the tubes, which, diverging to each side and dividing 

 form two denticles and a long bristle, the latter serrated on one side ; 

 cells oblique." Dr Fleming. 



6. F. Avicui.ARis, cells in 4 or Jive rows, oblong, with a strong 

 conical spine at each side of the aperture. J. Ellis. 



Plate xxxvi. Fig. 3, 4. 

 Corallina cum appendiculis lateralibus avium capitum forma, Ellis, Corall. 



pi. 38, fig. 7. Cellularia avicularia /?, Pall. Elench. 68. Flustra 



avicularis, Soverhy Brit. Misc. ii. 21. pi. 7L Turt. Brit. Faun. 210. 

 Flem. Brit. Anim. 536. Johnston in Trans. Newc. Soc. ii. 265 La 



