ON THE LABORATORY OF THE MARINE BIOLOGICAL ASSOCIATION. 485 
Marine Biological Association, The Laboratory, Plymouth.—Report of 
the Commuttee, consisting of Mr. G. C. BourNnE (Chairman), Pro- 
fessor E. Ray LanKkEsTER (Secretary), Professor M. Foster, and 
Professor S. H. VinEs, appointed to investigate the Relations 
between Physical Conditions and Marine Fauna and Flora. . 
Algological Notes for Plymouth District. By Mr. Grorce BREBNER. 
From January to April (1896) inclusive I had the privilege of occupying 
the British Association’s table. As a result of my investigations the 
following marine alge were added to the local flora, several of which were 
new to Britain, and others (marked thus *) were species or forms new to 
science. 
NEW TO BRITAIN. 
MyYxoPHYCE. 
Oscillatoria rosea, Crn. (Queen’s Ground.) 
Symploca atlantica, Gom. f. purpurea, Batt. (Yealm.) 
Hyella cespitosa, Born. et Flah. var. nitida, Batt. 
PHOPHYCES. 
Ralfsia disciformis (Crn.), Batt. (Yealm.). 
FLORIDES. 
*Acrochetium endophyticum, Batt. (Off west end of breakwater.) 
Cruoria rosea, Crn. f. purpurea, Batt. (Yealm.) 
Cruoriopsis cruciata, Duf. (Queen’s Ground.) 
Cruoriopsis Hauckii, Batt. (Off west end of breakwater.) 
Peyssonelia rupestris, Crn. (Queen’s Ground.) 
NEW TO PLYMOUTH DISTRICT. 
CHLOROPHYCE. 
Cladophora hirta, Kiitz. (Drake’s Island.) 
PHEOPHYCEX. 
Lithoderma fatiscens, Aresch. (Bovisand Bay). (Plurilocular spo- 
rangia not previously found in Britain.) 
FLORIDE. 
Acrochetium microscopicum, Nag. 
Peyssonelia Harveyana, Crn. (Queen’s Ground.) 
Rhododermis elegans, Crn. (Queen’s Ground, &c.) 
Lithothamnion Strémfeltii, Foslie. (Queen’s Ground.) 
Peyssonelia Rosenvingii Schm. (Wembury Bay.) 
The new species of Acrochetiwm is interesting on account of the main 
part of the thallus being endophytic—namely, in Dasya coccinea (Huds). 
Ag.—this alga therefore occupying in the genus Acrochetiwm a position 
analogous to that of Rhodochorton membranacewm Magn. in its genus. 
A. endophyticum, Batt., was described in the barren condition at the 
Linnean meeting of December 19, 1895, but the monosporangia were not 
found till January 1896. 
