Prof. W. Smith on the Diatomacese of the 



2. Brackish-water species. 



Epithemia constricta, Breb. 

 Trvblionella gracilis, W. Sm. 



punctata, W. Stn. 



mavginata, W. Sin. 



Navicula tuinens, IV. Sm. 



Navicula Araphisbcena jS, W. Sm. 

 Pinnularia peregrina, Ehr. 

 Nitzscliia dubia, fV. Sm. 

 Mastooloia Danseii, Thw. 

 lanceolata, Thw. 



3. Species collected at low elevations, marnj of ivldch also occurred 

 in the higher districts of the next class. 



Epithemia turgida, W. Sm. 



alpestris, W. Sm. 



Cymbella Hehetica, Kiitz. 



affinis, Kiltz. 



maculata, Kiitz. 



ventricosa, Kiitz. 



Amphora ovaUs, Kiitz. 

 Cocconeis Pediculus, Ehr. 



Placentula, Ehr. 



Cyclotella operculata, Kiitz. 

 Carapylodiscus costatus, JV. Sm. 

 Surirella angiista, Kiitz. 



ovata, Kiitz. 



ovahs, Breb. 



turgida, fF. Sm. 



Cymatojjleura Solea, fV. Sm. 



Hibernica, iV. Sm. 



elUptica, IV. Sm. 



Nitzschia minutissima, JV. Sm. 



sigmoidea, W. Sm. 



linearis, IV. Sm. 



Amphioxys, W. S'jn. 



Navicvda ambigua, Ehr. 



ovalis, W. Sm. 



dicephala, Kiitz. 



tmuida, JF. Sm. 



Amphirhynchus, Ehr. 



Pinnularia radiosa. JV. Sm. 



acuta, JV. Sm. 



viridis, JV. Sm. 



Stauroneiformis, JV. Sm. 



Stauroneifonnis ^, JV. Sm. 



Stauroneis Phcenicenteron, Ehr. 



gracilis, Ehr. 



■ anceps, Ehr. 



Stauroneis? rectangularis, Greg. 

 Pleurosignia attenuatum, JV. fe'ni. 

 Synedra radians, IV. Sm. 



Ulna, Ehr. 



pulchella, Kiitz. 



(Nitzschia) Palea, Kiitz. 



Cocconema lanceolatum, Ehr. 



Cistula, Ehr. 



cymbifornie, Ehr. 



Gomphonema capitatum, Ehr. 

 — — constrictum, Ehr. 



acuminatum, Ehr. 



dichotomum, Kiitz. 



olivaceura, Ehr. 



curvatum, Kiitz. 



cristatum, Ralfs. 



Meridion circulare, A(/. 



circulare, var. /3, fF. S?n. 



constrictum, Ralfs. 



constrictum, var. ^3, TF. Sm. 



Fragilaria capucina, Desm. 

 Odontidium mesodon, Kiitz. 



Tabellaria, IV. Stn. 



Diatoraa vulgare, Kiitz. 

 Denticula tenuis, Kiitz. 



inflata, JV. Sm. 



siuuata, Tl^. Sm. 



Achnanthidium lanceolatum, Br^b. 

 Achnanthes exilis, Kiitz. 

 ilelosira varians, Ag. 

 Orthosira arenaria, JV. Sm. 

 Mastogloia Smithii, Thw. 

 Encyouema prostratum, Ralfs. 

 csespitosum, Kiitz. 



4. Species collected at high elevations in the Auvergne. 



Epithemia rupestris, IV. Sm. 

 Eunotia Arcus, JV. Sm. 



gracilis, JV. Sm. 



tetraodon, Ehr. 



tridentula, Ehr. 



quaternaria, Ehr. 



quinaria, Ehr. 



Cymbella cuspidata, Kiitz. 

 Cocconeis Thwaitesii, JV. Sm. 

 Surirella biseriata, Breb. 



splendida, Kiitz. 



linearis, fF. Syn. 



Navicula rhomboides, Ehr. 

 rhynchocephala, Kiitz. 



