DIATOMACEAE. 
Synedra pulchella, Kutz. 
Saints Bay Valley, frequent. Fort Doyle pool, common. 
peat deposit, rare. 
Synedra acicularis, Sm. 
Synedra gracilis, Sm. 
Synedra minutissima, Sm. 
Pool by Fort Doyle, rather plentiful. 
Synedra tenera, Sm. 
Synedra Ulna, Ehr., and var. /3. 
Synedra deformis, Sm. 
Synedra investiens, Sm. 
Synedra radians, Kutz. 
Common generally in fresh-water gatherings in the south. 
Synedra Gallioni, Bory. 
More or less common all round the coast. 
Synedra fasciculata, Kutz. 
Synedra tabulata, Kutz. 
Synedra affinis, Kutz. 
Synedra Arcus, Kutz. 
Synedra superba, Kutz. 
Frequent, sometimes abundant, on all parts of the coast. 
Synedra fulgens, Sm. 
Generally distributed and common. 
AMPHIPLEUREAE. 
Amphipleura sigmoidea, Sm. 
NITZSCHIEAE. 
Tryblionella marginata, Sm. 
333 
Cobo, 
Quarry marsh at Bordeaux, scarce. Cobo peat, two specimens. 
Tryblionella punctata, Sm. 
Tryblionella acuminata, Sm. 
Sparingly in the brackish pool at Pulias. 
