DES MOUSSES DU MONT-BLANC. 399 
CymBELLA flexella, Kuetz. ; 
CocconemA cistula, Hump.—Cymbella minor, Ag. Gomphonema. 
parvum , Sm. 
pachycephalum, Raben. — C. cymbiforme, Rabenorst. 
lanceolatum, Sm. 
ENGYoNEMA cæspitosum , Kuetz. 
AMpPHORA minulissima, Sm. 
| ovalis, Kuetz., Rab. — Navicula amphora , Ebrb. 
affinis , Kuetz, 
Cocconeïs placentula, Ehrb. 
fasciata , Ehrb. 
Thwaïlesii, Sm. 
diaphana. Sn. 
ACHNANTHES exulis, Kuetz. 
DENTICULA tenuis, Kuetz. 
minula , Sm. 
sinuata , Sm. 
OponTipium hiemale, Lynb., Sm. 
mesodon , Kuetz. — Fragilaria mesodon , Ebrb. 
FRAGILARIA mutabilis, Sm.— Odontidium mutabile, Sm. 
Harrissonti, Sm. 
construens. Ehrb. — Staurosira construens, Ebrb. 
virescens, Ralfs. — Fragilaria pectinalis, Ehrb. 
undata, Sm. 
capulina, Desmaz. 
DiaToMA elongata, Ag. —— v. vulgare. 
tenue, Ag. 
SYNEDRA lunaris, Ehrb. 
longissima , Sm. 
pulchella, Kuetz. 
Vaucheriæ, Kuetz. 
ulma, Ehxb. 
amphyrrhynchus, Ehrb. 
delicatissima, Synedra gracillina , Sm. 
radians, Kuetz. 
» v. debilis, Raben. 
» v. tenuissima, Raben. — Synedra debilis, Kuetz. 
Galliontr , Bory. — Navicula Gallionni , Bory. 
AMPHIPLEURA pellucida , Kuetz. — Frustulia pellucida, Kuetz. 
TRYBLIONELLA , angustata, Sm. 
gracilis, Sm. 
| acuminaia, Sm. 
NirzscHiA amphyoxis , Ehrb. — Eunotia amphyoxis, Ehrb. 
» v. elongata, Raben. — Navicula vivax, Sm. 
parvula, Sm. 
Sygmoïdea , Raben. — Bacillaria Sygmoïdea , Nitzsch. 
