284 THE DIATOMS OF GUERNSEY. 



N. Brebissonii. Grande Mare. 

 N. Sigma. Common generally. 

 N Obtusa. A few specimens in a peaty deposit from Cobo. 



N. speetabilis. 



N. sealaris. Not uncommon in a brackish marsh between Grande Mare 

 and Vazon. Occasional specimens on other parts of the north-west coast. 



N. insignis. 



N. linearis. Common generally. 



N. palea. Valley below Le Casrouge (IV). 



N. spathulata. 



N. biFOStrata. Salerie, one specimen. Cobo, a few. 



N. closterium. 



N. socialis. 



Amphipleura sigmoidea. 



Baeillaria paradoxa. 



Homceocladia filiformis, var. B. 



Synedra lunariS. Saint's Bay Valley. 



S. longissima. "Curiously intermediate between S. longissima and 8. 



radians" (Bylands). 

 S. pulchelia. Generally distributed. 

 S. minutissima. Pool by Fort Doyle. 

 S. gracilis. 

 S. aeieularis. 

 S. undulata. Several very fine specimens in a gathering from rocks and 



corallines at extreme low water mark, Bordeaux. 

 S. radians. Common in the valleys in the 6outh. 

 S. tenera. 

 S. investiens. 

 S. deformis. 

 S. ulna. 



S. Gallionii. Frequent all round the coast, 

 S. faseieulata. 

 S. tabulata. 

 S. afflnis. 

 S. areus. 



S. fulgens. Generally distributed. 

 S. SUperba. Common generally. 



Dimeregramma minor. 



D. nanum. 



D. distans. 



D. fulvum. 



D. marinum. 



D. mutabile. 



Doryphora amphiceros. 



Tryblionella gracilis. Pool by Fort Doyle. 



T. marginata. Marsh at Bordeaux. Cobo peat deposit. 



T. acuminata. Brackish pool, Pulias (IX.) 



T. angustata. 



T. punctata. 



