THE MARINE BOTANIST. 91 



E, tessellatus. Filaments somewhat tufted, 

 from two to four inches long-, very light and 

 feathery as they float in the sea ; not much 

 branched, as compared with other species of Ecto- 

 carpus, but bearing a remarkable outward resem- 

 blance to E. fasciculatus. Silieules sessile, abun- 

 dantly scattered on the upper surface of the penul- 

 timate ramuli, varying in shape from oval to 

 elliptical, and sometimes inclining to reniform, re- 

 gularly tessellated with minute dark squares, w^hich 

 are clearly defined under a glass of moderate power 

 by pellucid lines, that intersect each other at right 

 angles. Discovered by the Rev. F. W. Hay den in 

 July, 1851, at Filey Bridge, Yorkshire. Annual. 

 Summer. Grows on rocks, shells, at low water, and 

 completely clothes the fronds of H. lorea, in the 

 above locality." See for Fig. and description, vol. 

 1st, p. 149, of the " Naturalist." 



E. fasciculatus grows on the larger algae. Aur 

 nual, summer. Not uncommon on L. digitatay L. 

 bullosa, and H. lorea. Tufts from one to two 

 inches high. Hamuli to the naked eye appear very 



