39 



Ilah. On fk)aling fuci ; on fnci near low water mark, on 

 the iimler surf;ice of stones in brackish water; gregarious; 

 abundant through the year. 



This small species varies from half an inch, to one inch 

 in height, and is liable to variations in colour from a white 

 to a deep red. It is gregarious on almost all the larger sea 

 weed, about the tide marks, especially the Fucus serralus. 

 It is rooted by small creeping tubular (ibres, which trail along 

 the surface of the substance on which it grows and gives off 

 new polypidoms at irregular intervals in its course. It is 

 erect and sparingly branched, the stem is zig-zag and divided 

 into joints. At tbe upper extremity of each internnde is an 

 enlargement, on which rests a ringed peduncle which bears 

 the cell. The peduncle is composed of from four to six 

 annulations. The cells are campanulate with even unarmed 

 apertures. The vesicles are axillary, vasiform, and are to 

 be found throughout the summer. The horny sheath of this 

 and the following species, is so transparent, that the central 

 granular pulp, and the polypes with their tentacula may be 

 distinctly seen through its sides. The number of tentacula 

 varies from fourteen to twenty eight. 



Some of the finest specimens I have seen were growing on 

 the dorsal and caudal fius of a Picked Dogfish. 

 L. GELATINOSA. " Subordinate branches dichotomously 



branched; cells on twisted footstalks, campanulate, with 



even margins." Ellis. PI. x. 



Fucoides setaceum tenuissime alatum, Raii, Synop. Stirp.» 

 vol. 1, p. 38, no. 6, pi. 2, tig. 2. Coraliina filiformis ramosa 

 pedunculis calyculorum contortis, Ellis' Coral., pi. 38, fig. 3, 

 p. 23, pi. 12, fig. c C. Sert. gelatinosa, Stewart's Elem., 

 vol. 2, p. 444. Campanularia gelanlinosa, Fleming's Brit. 

 An., p. 549. L. gelatinosa, Johnston's Brit. Zooph., p. 152, 

 pi. 21, figs. 3 and 4, pi. 23, fig. 1. 



Hab. On stones near low water mark and in pools. Pol- 

 perro ; common. 



"This species" Johnston says ''in its most perfect state 

 rises to the height of eight or ten inches." But it is more 

 commonly found about one, and so closely resembling the 

 last that it will be best described in connection with it. la 

 the habit and mode of growth there is but little distinction. 

 In this the stem is more waved, not so zig-zag, and more 

 slender; the cells are larger and deeper; the footstalks 

 longer and not situated on any swelling of the stem. The 

 vesicles are vasiform, axillary, and on ringed footstalks. 

 T he manner in which the gemmules are produced differs. In 

 the last species the whole of the granular pulp is formed into 

 the gemmules, then they escape, leaving the case empty ; m 



