DIATOMACEAE. 327 
Melosira varians, Ag. 
Common in pools, marshes, and water-troughs. 
Orthosira orichalcea, Sm. 
Orthosira marina, Sm. 
Cobo, plentiful in rock scrapings. 
SURIRELLEAE. 
Campylodiscus limbatus, Breb. 
Campylodiscus costatus, Sm. 
Common in bogpools at Grande Mare. Saints Bay Valley, 
scarce. A few valves in the submarine peaty deposit at Cobo. 
Campylodiscus clypeus, Ehr. 
Campylodiscus parvulus, Sm. 
Campylodiscus simulans, Greg. 
Common at Cobo. Frequent in shore gatherings from other 
parts of the coast. 
Campylodiscus Hodgsoni, Sm. 
Campylodiscus eximius, Greg. 
Campylodiscus Ralfsii, Sm. 
Moulin Huet, in rock scrapings, sparingly. 
Campylodiscus spiralis, Sm. 
Saints Bay Valley, plentiful. In bog pools at Grande Mare, 
scarce. 
Campylodiscus decorus, Breb. 
Not uncommon at extreme low-water mark all round the coast. 
Surirella linearis, Sm. 
Marsh at the eastern end of Lancresse, plentiful. Mostly the 
linear acuminate form. 
Surirella biseriata, Breb. 
Abundant at a spring in the valley below Casrouge, Forest. 
Surirella angusta, Kutz. 
Surirella splendida, Kutz. 
Saints Bay Valley, plentiful in some gatherings. 
Surirella striatula, Turp. : 
Abundant in the brackish pool at Pulias. Common and fine in 
the submerged peaty deposit at Cobo. 
