Dr. Johnston's Catalogue of Zoophytes. 263 



long spine on the outer angle ; the sides furnished with anomalous appendages. — 

 Bird' s-head Coralline- 



C. avicularia, Soland- Zooph. 22 ; Lam. Hist- Nat. ii. 141 ; Bosc, Vers, Hi. 131. 



Sertularia avicularia, Linn. ; Turt. Lin. iv. 685 ; Turf. Br. Faun. 216 ; Stew. Elem. ii- 

 448. 



Crisia avicularia, Lamour. Corall. 61. 



Cellularia avicularia, Hogg's Stockton, 35. 



Bird's-head Coralline, Ellis, Corall. 36, t. xx. no. 2, fig. a. 



Hab. Attached to other Corallines in deep water. 



About one and a half inch high, white, bushy, chiefly remarkable on account of the curi- 

 ous appendages which are articulated to the sides of the cells. Ellis has delineated them 

 with his usual accuracy, and has aptly compared them to a " bird's head, with a crooked 

 beak, opening very wide." They are very small, about one-fourth the size of the cell, and, 

 when the coralline is in a living state, are in continual motion, moving upwards and 

 downwards with the regularity of a pendulum : their use is unknown. The polypes have 

 twelve simple uniform tentacula, and lie concealed in their cells, which are disposed in two 

 rows, with apertures that face one way. The spine at the outer angle is either frequently 

 wanting or broken off. Within the polype-cells, a spot of a bright scarlet colour is often 

 perceptible : it is probably produced by a cluster of ova. 



The habit of this Coralline is so very different from that of Flustra avicularis described 

 below, that it is difficult to believe they can be merely different states of the same species, 

 as Dr. Fleming and some others maintain. 



V. Z. CELLULIFERA. 



14. FLUSTRA, 



* Polypidom free, branched. 

 . F.foliacea, polypidom thickish, spreading, deeply divided into numerous broad segments, 



rounded at the ends ; cells on both sides, small, oblong, the margin armed with short 



blunt spines. Broad-leaved Sea-mat. 

 F. foliacea, Linn. ; Soland. Zooph. ii. t. ii. f. 8 ; Turt. Lin. iv. 663; Turt. Br. Faun. 



209; Stew. Elem. ii. 435; Lam. Hist. Nat. ii. 156; Bosc, Vers, iii. 140; Lamour. 



Corall. 44 ; Flem. Br. Anim. 535; Hogg's Stockton, 36; Grant in Edin. New. Phil. 



Journ.for Oct. 1827, p. 337, and for April, 1827, p. 111. 

 Eschara foliacea, Lin. Syst. 104, edit. 10th. 



Fucus telam lineam sericeamve textura sua Eemulans, Rail Syn. 42, No. 9. 

 Curious Sea-weed, Hooke, Micrographia, 140, t. 9, f. 2, and t. 14, f. 1. 

 Broad-leaved Hornwrack, Ellis, Corall. 70, t. xxix. No. 2, f. a, A, B, E. 

 Hab. Amongst sea refuse, common. 

 VOL. II. 3 H 



