THE DIATOMS OF GUERNSEY. 289 



Pinnularia nobilis. Frequent. 



P. major. Rather common. 



P. Viridis. Common. 



P. aCFOSphseria. Casrouge Valley. Saint's Bay Valley. 



P. Tabellaria. 



P. divergens. Marsh on eastern side of l'Ancresse, near the shore. A 



rather small form resembling Smith's P. stauroneif oralis, var. B. 

 P. interrupta. Valley below Le Casrouge (IV.) 

 P. acuminata. 

 P. Allmaniana. 



P. radiosa. Cobo peat deposit. 



P. gracilis. Marsh between Grande Mare and Vazon. 

 P. acuta. Grande Mare. 

 P. peregrina. Common. 

 P. longa. Cobo, two specimens. 

 P. aeutiuscula. 

 P. distans. Common. 

 P. borealis. 



P. ODlonga. Grande Mare. 

 P. viridula. Common. 

 P. cyprinus. Brackish pool at Pulias. 

 P. hemiptera. 



Stauroneis anceps. Valley below Le Casrouge. 

 S. linearis. 



S. Phcenieenteron. Not uncommon generally. 

 S. gracilis. Generally distributed. 

 S. pulchella. Common ; very variable in size. 

 Pieurosigma macrum. Cobo, one fine specimen. 

 P. prolongatum. 



P. areuatum. Quarry marsh at Bordeaux. 

 P. Wansbeekii. Perelle Bay, one specimen. 

 P. formosum. A single valve in the Cobo peat. 

 P. decorum. Common. 

 P. angulatum. Common in brackish pools. 

 P. quadratum. Pulias pool, one. 

 P. naviculaeeum (transversale). Eather common. 

 P. nubecula. Generally distributed. 

 P. intermedium. 



P. rigidum. Rather common in low water gatherings. 

 P. elongatum. Brackish pool at Bordeaux. 

 P. strigosum. Cobo. 



P. Spencerii. Roadside near Hougue du Pommier. Cobo peat deposit. 

 P. attenuatum. Saint's Bay Valley. Fort Doyle pool. 

 P. acuminatum. 



P. hippocampus. Marsh between Grande Mare and Vazon. 

 Toxonidea insignis. Cobo, three valves. Perelle, one. 

 Donkinia COmpacta. Perelle Bay, one valve. 



Amphiprora alata. Marsh at Bordeaux, plentiful. Scattered specimens 

 elsewhere. 



