Flustra. ZOOPHYTA. FLUSTRADyE. 537 



147. F. pilosa. — Cells rather remote, nearly circular, the 

 margin with numerous inflected teeth. 



Eschara millepora, Ellis, Coral. 73. t. xxxi. — F. pil. Linn. Syst. i. 1301.—. 

 F. lineata, Fab. Fauna Groen. 437. — Common on fuci. 

 This species invests the stalks of narrow-leaved marine plants, and some- 

 times appearing as if foliaceous, with cells on both sides ; the cells below are 

 gibbous, and the intervening spaces are covered with pellucid points ; the 

 teeth vary in number, from six to eight, the one near the base is usually pro- 

 duced into a long simple hair, giving the whole a hispid appearance. When 

 this long hair is absent, the coralline has been termed Flustra dentata (Sol. 

 Ellis, Zooph. 15.), and is figured by Ellis (Phil. Trans. 1753, 631. t. xxii. f. 4.) 

 with the base of the polypi tubular, and the head with twelve tentacula. 



148. F. hispida. — Substance fleshy, cells remote, aperture 



contracted ; armed at the top with spinous processes. 



Fab. Faun. Groen. 438. Jameson, Wern. Mem. 563 Investing Fucus 



serratus ; every where common. 



Substance thick, tough, full of mucus ; brown ; base of the cells, where 

 attached, contiguous and angular ; at the surface the cells are ovate, the 

 aperture lunate ; polypi with an enlarged head, and from twenty to thirty 

 tentacula. The F. hispida of Pallas is a different species. 



