DIATOMACEAE. 329 
Epithemia Argus, Kutz. 
Plentiful in the Grande Mare pools, and in the gelatinous. 
drippings from the base of the cliffs at Petit Port. 
Himantidium gracile, Grun. 
Valley below Casrouge, in a spring, plentiful. 
Himantidium pectinale, Kutz. 
Scattered valves in the submarine peat deposit at Cobo. 
Himantidium undulatum, Sm. 
Common in the marsh between Grande Mare and Vazon Bay. 
CYMBELLEAE. 
Cymbella cuspidata, Kutz. 
Grande Mare pools; not common. 
Cymbella maculata, Kutz. 
Marsh on the eastern side of Lancresse, sparingly. 
Cymbella affinis, Kutz. 
Cymbella ventricosa, Ag. 
Cocconema lanceolatum, Ehr. 
Plentiful in the pools at Grande Mare and Lancresse. Rather 
common in the Cobo peat. 
Cocconema cymbiforme, Ehr. 
Common in gelatinous drippings from rocks at Petit Port 
Cocconema Cistula, Hemp. 
Amphora binodis, Greg. 
Perelle Bay, sparingly, among rock scrapings. 
Amphora laevissima, Greg. 
Amphora minutissima, Sm. 
Amphora acuta, Greg. 
Amphora lineata, Greg. 
Frequent in gatherings from Cobo at extreme low-water mark. 
Amphora salina, Sm. 
Salerie, scarce ; only a few frustules seen. 
Amphora costata, Sm. 
Cobo, common in rock scrapings. 
