SHEAWEEDS. 303 
SEAWEEDS. 
THE earliest list we have of the marine Algae of Guernsey is the 
one given on p. 125 of the Flora Sarnica, for which the author 
says he is indebted to Mr. H. O. Carré, one of the Judges of the 
Royal Court, and afterwards Lieutenant-Bailiff of the island. This 
small but accurate list, which must have been compiled before the 
year 1839, comprises 37 species, excluding Lzchina pygmaea, a 
lichen. A more lengthy catalogue is to be found in the Phy/ologist, 
first series, vol. i. p. 172, Where Dr. R. K. Greville, the eminent 
algologist, communicates the names of 83 seaweeds collected in 
Guernsey in 1841 by Mr. D. Ross, of Lasswade. Some twenty 
years later another list was published in the second edition of 
Ansted’s Channel Islands, p. 191. It was contributed by Miss Le 
Lievre, and consists of 123 marine algae—not 223, as misprinted in 
the summary of the flora on p. 198. 
Yet another list, this time with localities and distribution, ap- 
peared in the Zvansactions of the Guernsey Society of Natural Science 
for 1894: it comprised 236 seaweeds collected in the island by my 
wife and myself during the summer and autumn months of the two 
previous years. For the identification of four species which were 
then new to Britain, as well as for the determination of a great 
many critical and puzzling forms, I am indebted to Mr. E. M. 
Holmes, FL S. 
In the following pages I have followed the order and the names 
used in Holmes and Batters’ Revised List of British Marine Algae 
(1892), inserting in brackets, whenever necessary, the older and 
perhaps more familiar names of Harvey’s Phycologia Britannica 
The seaweed flora of Guernsey, as now recorded, consists of 252 
species. 
CYANOPHYCEAE. 
Pleurocapsa amethystea, Rosen. 
Parasitic on Cladophora rupestris. Petit Port. 
Oscillaria corallinae, Gom. (0. “toralis, Phyc. Brit. partim.) 
Bordeaux. 
Lyngbya semiplena, J. Ag. (Calothrix caespitula.) 
Petit Port. Cobo. St. Martin’s Point. Fermain. 
Lyngbya majuscula, Harv, 
Cobo: common in some of the pools at high-water mark. 
