SEAWEEDS. 
Rhodochorton Rothii, Nag. (Cad/ithamnion.) 
Common. 
Rhodochorton floridulum, Nag. 
Petit Port. Lancresse Bay. 
Callithamnion roseum, Harv. 
Noted in Miss Le Lievre’s list. 
Callithamnion Hookeri, C. Ag. 
Belgrave Bay. Grandes Rocques. Bordeaux. 
Callithamnion arbuscula, Lyng. 
Noted in Miss Le Lievre’s list. 
Callithamnion tetragonum, C. Ag. 
Frequent in the south. 
(Callithamnion brachiatum, Phyc. Brit, occurs in Alderney.) 
Callithamnion tetricum, C. Ag. 
Occasional all round the coast. 
Callithamnion corymbosum, Lyng. 
Common. 
Callithamnion granulatum, C. Ag. 
Fermain. Petit Bot. Moulin Huet. 
Callithamnion byssoides, Arn. 
Moulin Huet. Cobo. Bordeaux. 
Compsothamnion thuyoides, Schm. 
Fermain Point. 
Plumaria elegans, Bon. (/¢/o/a.) 
Rather common. Grows on the vertical faces of rocks. 
(Ptilota plumosa, C. Ag., occurs in Sark.) 
(C spongiosum.) 
Petit Port. 
(Callithamnion.) 
Antithamnion plumula. Thur. (Cad/ithamnion.) 
Vazon Bay: one specimen washed up. 
Crouania attenuata, J. Ag. 
Common generally : in some places abundant. 
Ceramium tenuissimum, J. Ag. (C. 2Zosum.) 
Rocquaine Bay. Cobo. 
Ceramium Deslongchampsii, Chauv. 
Bordeaux. 
317 
Lancresse Bay. 
