332 GUERNSE Y. 
FRAGILARIEAE. 
Denticula tenuis, Kutz. 
Denticula obtusa, Sm. 
Denticula decipiens, Rylands’ MS. 
‘ Was found originally by Prof. Walker-Arnott. It appears to be 
very generally distributed. Character and description will be pub- 
lished in due course.’ (Rylands.) 
Odontidium mesodon, Kutz. 
Saints Bay Valley, common in one gathering. 
Plagiogramma Gregorianum, Grev. 
Plagiogramma interruptum, Greg. 
Plagiogramma inaequale, Grev. 
Plagiogramma laevis, Greg. 
Fragilaria capucina, Desm. 
Abundant in a marsh at the eastern side of Lancresse Common. 
Fragilaria virescens, Ralfs. 
Diatoma hyalinum, Kutz. 
Dimeregramma minor, Ralfs. 
Dimeregramma nanum, Ralfs. 
Dimeregramma distans, Ralfs. 
Dimeregramma fulvum, Ralfs. 
Dimeregramma marinum, Ralfs. 
Dimeregramma mutabile, Ralfs. 
Doryphora amphiceros, Sm. 
Synedra lunaris, Ehr. 
Saints Bay Valley, common in one of my ey nerhies 
Synedra longissima, Sm. 
‘Curiously intermediate between S. dougissima and S. radians’ 
(Rylands). 
Synedra undulata, Sm. 
Several fine and perfect specimens, as well as some broken ones, 
in a gathering from rocks and corallines at extreme low-water mark, 
on the coast near Bordeaux. 
