288 THE DIATOMS OF GUERNSEY. 



G. vibrio. 



G. diehotomum. Marsh on l'Ancresse Common. 



Navicula ineurvata. 



N. musea. 



N. bombus. Cobo. Perelle. 



N. didyma (of Gregory). Frequent. 



N. didyma (of Smith) . Common. Var. B. (" sporangial ' ' of Smith) . Single 



valves have occurred in many coast gatherings. 

 N. pandura. Common. 



N. mesotyla. 



N. lsevissima. 



N. gibberula. Saint's Bay Valley. 



N. lyra. Occasional in coast gatherings, varying much in size. 



N. foreipata. 



N. Hennedyi. Salerie. Cobo. Perelle. 



N. elavata. Cobo. Perelle. 



N. nebulosa. 



N. prsetexta. Perelle Bay, a few specimens. 



N. ealiforniea. Cobo, a few. My specimens come nearest to this species, 

 but do not quite agree. I have also found one or two more species 

 belonging to this beautiful group which are undescribed in any work to 

 which I have access. 



N. Smithii. 

 N. fusea. 



N. lineata. Cobo, a few valves. 



N. elliptiea (ovalis, Smith). Common. 



N. minutula. Roadside by Hougue du Pommier. 



N. SBStiva. Not uncommon. Easily recognised by the dry valve being 



bright blue. 

 N. inflata. 

 N. amphisbcena. Common. Var. B. (of Smith). Brackish pools at Pulias 



and Fort Doyle. 



N. pusilla. 



N. punetulata (Smith). Pulias pool. 

 N. erassinervia. Saint's Bay Valley. 

 N. dieephala. 



N. cryptocephala. Common. 

 N. lacustris. 



N. humerosa. Specimens have occurred sparingly in most of my coast 



gatherings. 

 N. granulata. Salerie, one valve. 

 N. latissima. 

 N. rhombiea. 



N. palpebralis. Salerie and Cobo, sparingly. 

 N. angulosa. Perelle Bay, a few specimens. 



N. CUSpidata. Hougue du Pommier roadside. Pool by Fort Doyle. 

 N. elegans. Marsh between Grande Mare and Vazon. Plentiful in the 



Cobo peat deposit. 

 N. liber. Not uncommon. 

 N. peetinalis. . 



