AND ADJACENT WATERS. 297 



along any weeds required. The brackish waters o£ the Laira are 



not so rich as those off St. Peter's Point and Beggar's Island in the 



Hamoaze. I found — 



Autithamnion plumula, a and j3. Pleonosporium Borreri. 



Delesseria hypoglossum. Pylaiella littoralis. 



Species of CallithamnioUj Poly- Ectocarpus tomentosus. 



siphonia, and Ceramium. 



I must have overlooked GritHthsia. Leaving the Laira^ one may 

 find, on the projecting end of Batten Pier amongst other plants, 

 Antithariinion plumula, ji, and CaUithamnion gracilliraum j and in 

 Batten Bay, in the region of the Cobbler Buoy, — 



CaUithamnion thuyoideum. 

 Antithamnion cruciatum. 

 Monospora pedicellata. 

 Rhodymenia palmata, R. laci- 

 niata, R. palmetta. 



Rhodophyllis bifida. 

 Chylocladia clavellosa. 

 Stilophora rhizodes, 1-loc. and 



8-loc. sporangia. 

 Bryopsis plumosa. 



I propose now to consider that part of the Sound which is on the 

 English Channel side of the Breakwater, and to begin with — 



Cawsand Bay. 



This bay, especially in its south-west part, is pre-eminently the 

 habitat for Spyridia filamentosa and the different species of Ceramium. 

 The sandy rock-pools with stones in them, on the north side of the 

 bay from Picklecombe Fort westwards, are especially good, and pro- 

 vide one of the best localities in Plymouth for the examination of 

 littoral weeds, the following amongst others being found here : 

 Gracilaria confervoides, in abun- Chantransia virgatula. 



dance. j Gymnogongrus plicatus. 



Polyides rotundus. j Porphyra. 



Fastigiaria furcellata. Scytosiphon lomentarius. 



Rhodomela subfusca. Asperococcus. 



Dasya arbusculaand D.coccinea. Pylaiella littoralis. 



Chylocladia, Ceramium, Polysi- Myriotrichia clavseformis, 1-loc, 



phonia, CaUithamnion. sporangia. 



Rhodymenia, species. Sphacelaria, Cladostephus, Des- 



Gelidium corneum. marestia aculeata. 



Gigartina mamillosa. Ectocarpus, Ulva, Enteromor- 



Very little Delesseria or Nito- pha, Cladophora. 



phyllum. Bryopsis plumosa. 



Shore-hunting on the south side can scarcely be carried on at all 

 except in a boat, and the flora is not rich in variety, Laurencia, 

 Chylocladia, Polysiphonia, Ceramium, being the more important 



