334 GUERWNSE Y. 
Tryblionella angustata, Sm. 
Tryblionella apiculata, Greg. 
Tryblionella constricta, Greg. 
Rather frequent in shore gatherings from various parts. 
Tryblionella gracilis, Sm. 
Pool by Fort Doyle, frequent. Mr. Rylands notes the var. 
(. minor in his list. 
Nitzschia Amphioxys, Sm. 
Moulin Huet cascade, sparingly. Roadside rivulet near Lilyvale, 
frequent. Fort Doyle Pool, scarce. 
Nitzschia vivax, Sm. 
Marsh between Grande Mare and Vazon, frequent. 
Nitzschia dubia, Sm. 
Common in the Pulias pool. Mr. Rylands notes both the type 
and the var. /. 
Nitzschia plana, Sm. 
Nitzschia parvula, Sm. 
Common in a roadside streamlet near Lilyvale, Catel. 
Nitzschia panduriformis, Greg. 
Nitzschia sigmoidea, Sm. 
Pool by Fort Doyle, plentiful. 
Nitzschia Brebissonii, Sm. 
Occasional in the pools at Grande Mare. 
Nitzschia obtusa, Sm. 
In the submerged peaty deposit at Cobo, sparingly. 
Nitzschia Sigma, Sm. 
Common in brackish pools, and on the shore. 
Nitzschia linearis, Sm. 
Generally common in fresh-water gatherings. 
Nitzschia minutissima, Sm. 
Nitzschia Palea, Sm. 
Valley below Casrouge, common in a water-trough. 
Nitzschia spathulata, Breb. 
