31S " BRITISH SEA-WEEDS. {CUorosj-^evmea. 



Genus XCI. EHIZOCLOXIU^il, KUzing. 



Gen. Char, rilainents green, jointed, uniform, decumbent, 

 simple, or spuriously branched. Fructification, granules con- 

 tained in the cells. — Name from the root-like form of the 

 branches. — Harvey. 



1. Ehizocloxium iiiPAiiiUM, Kiltzhig. 



Hab. Sand-covered rocks near high-water mark. Annual. 



Genus XCII. CONFEEVA, FUn. 



Gen. Char. Filaments green, jointed, attached or floating, 

 unbranched. Fructification, aggregated granules or zoospores 

 contained in the joints, having at some period a proper ciliary 

 motion. — Ilarveg. 



1. Conferva tortuosa, Blllwyn. (Plate XYIII. fig. G9, 

 plant natural size, and under it one of the filaments, mag- 

 nified.) 



Hab. On submarine rocks; also in salt pools. Mr. 

 Dilhvyn at Swansea ; Prof. AValker Arnott, and Dr. Greville, 

 Frith of Forth; Professor Harvey, Skerries; D.L., Saltcoats. 



2. Conferva Melagonium, Weh. and Mohr. (Plate 

 XVIII. fig. 70, filaments, natural size : and to the right, a 

 portion of a filament, magnified.) 



