342 GUERNSEY. 
Gomphonema acuminatum, Ehr. 
Generally distributed and rather common. 
Gomphonema olivaceum, Kutz. 
Valley below Casrouge, and Saints Bay Valley, sparingly. 
Gomphonema curvatum, Kutz. 
Streamlet near Lilyvale, Catel. 
Gomphonema marinum, Sm. 
MERIDIONEAE. 
Meri lion constrictum, Ralfs. 
Meridion marinum, Greg. 
Podosphenia Ehrenbergii, Sm. 
Rhipidophora Dalmatica, Kutz. 
Rhipidophora Lyngbye1, Kutz. 
Rhipidophora paradoxa, Lyng. 
Rhipidophora elongata, Sm. 
Abundant on algae at Bordeaux and Cobo. 
Licmophora splendida, Grev. 
Licmophora flabellata. Ag. 
Generally distributed and in some localities abundant in rock- 
pools. By a curious oversight the names of the only two species of 
Licmophora are reversed in Smith’s monograph of the British Diato- 
maceae. The ZL. splendida of that work is the Z. flabellata of Agardh, 
and Smith’s Z. flabellata is the true L. splendida of Greville. 
singular error was pointed out by Mr. Roper in 1863. Both species 
were gathered in Guernsey by Wallich (es¢e Rylands). 
TABELLARIEAE. 
Grammatophora marina, Kutz. 
Common all round the coast. 
Grammatophora macilenta, Sm. 
Sparingly in a gathering from Perelle Bay. 
