THE DIATOMS OF GUERNSEY. 283 



apparently undescribed, at least in any work to which I have 

 access, have not been noted in this paper. 

 Epithemia gibba. Common in gatherings from Grande Mare. 

 E. ventrieosa. 



E. argUS. Grande Mare. Base of cliffs at Petit Port. 



E. eonstrieta. 



E. museulUS. Brackish pools, north-west coast. 

 E. Westermanni. Grande Mare. Petit Port. L'Ancresse. 

 E. turgida. Generally distributed, but not common. 

 E. granulata. 



E. marina (JDonk.) Kock scrapings at extreme low water mark, Cobo, two 



frustules. 



Himantidium peetinale. Cobo. 



H. graeile. Valley below Le Casrouge (IV). 



H. undulatum. Marsh between Grande Mare and Yazon. 



Meridion eonstrictum. 



M. marinum (Greg.) 



Podosphsenia Ehrenbergii. 



Rhipidophora Dalmatiea. 



R. Lyngbyei. 



R. paradoxa. 



R. elongata. Common generally. 



Licmophora splendida. 



L. flabellata (of Smith) . Generally distributed. 



Podoeystis Americana. Mr. Rylands says "Two valves only, seen in 

 different slides. Locality, Cobo rocks at extreme low water, on corallines 

 attached to the rock." 



Dentieula tenuis. 



D. obtusa. 



D. deeipiens (Ryl. M.S.) 



Plagiogramma Gregorianum. 



P. interruptum. 



P. insequale. 



P. laevis. 



Odontidium mesodon. Saint's Bay Valley. 



Fragilaria capueina. Marsh on l'Ancresse Common. 



F. virescens. 

 Diatoma hyalinum. 



NitZSChia amphioxys. Generally distributed. 

 N. vivax. Marsh between Grande Mare and Vazon. 



N. parvula. Common in a gathering from the roadside near Hougue du 

 Pommier (VIII). 



N. minutissima. 



N. virgata. 



N. dubia. Brackish pool at Pulias (IX). 



N. plana. 



N. panduriformis. 



N. Sigmoidea. Pool by Fort Doyle. 



