Prof. W. Smith on the Diatomaceje of the 



2. Brackish-water species. 



Epithemia constricta, Breb. 

 Trvblionella gracilis, W. Srn. 



punctata, W. Sm. 



marginata, W. Sm. 



Navicula tumens, W. Sm. 



Navicula Araphisbcena ^, W. Sm, 

 Pinnularia peregrina, Ehr. 

 Nitzschia dubia, W. Sm. 

 Mastogloia Daiiseii, Thw. 

 lanceolata, Thw. 



3. Species collected at low elevations, mani/ of which also occurred 

 in the higher districts of the next class. 



Epithemia turgida, W. Sm. 



alpestris, W. Sm. 



Cymbella Helvetica, Kiitz, 



affinis, Kiitz. 



maculata, Kiitz. 



ventricosa, Kiitz. 



Araphora ovalis, Kutz. 

 Cocconeis Pediculus, Ehr. 



Placentula, Ehr. 



Cyclotella operculata, Kiitz. 

 Campylodiscus costatus, W. Sm. 

 Surirella angusta, Kiitz. 



ovata, Kiitz. 



ovalis, Breb. 



turgida, ^V. Sm. 



Cymatopleura Solea, W. Sm. 



Hibernica, W. Sm. 



elliptica, IV. Sm. 



Nitzschia minutissima, W. Sm. 



sigiioidea, W. Sm. 



linearis, W. Sm. 



Amphioxys, W. S7n. 



Navicula ambigua, Ehr. 



ovahs, W. Sm. 



dicephala, Kiitz. 



tuinida, W. Sm. 



Amphirhynchus, Ehr. 



Pinnularia radiosa, W. Sm. 



acuta, W. Sm. 



viridis, W. Sm. 



Stauroneiformis, W. Sm. 



Stauroneiformis /3, W. Sm. 



Stauroneis Phoenicenteron, Ehr. 



gracilis, Ehr. 



anceps, Ehr. 



Stauroneis? rectangularis, Greg. 

 Pleurosigma atteuuatum, W. Sm. 

 Synedra radians, W. Sm. 



Ulna, Ehr. 



pulchella, Kiitz. 



(Nitzschia) Palea, Kiitz. 



Cocconema lanceolatum, Ehr. 



Cistula, Ehr. 



cymbiforme, Ehr. 



Gomphonema capitatum, Ehr. 



constrictum, Ehr. 



acuminatum, Ehr. 



dichotomum, Kiitz. 



olivaceum, Ehr. 



curvatum, Kiitz. 



cristatum, Ralfs. 



Meridion circulare, Ag. 



circulare, var. ^, W. Sm. 



constrictum, Ralfs. 



constrictum, var. /3, W. Sm. 



Fragilaria capucina, Desm. 

 Odontidium mesodon, Kiitz. 



Tabellaria, W. Sm. 



Diatoma vulgare, Kiitz. 

 Denticula tenuis, Kiitz. 



inflata, W. Sm. 



sinuata, W. Sm. 



Achnanthidium lanceoktum, Breb. 

 Aclmanthes exilis, Kiitz. 

 Melosira varians, Ag. 

 Orthosira arenaria, W. Sm. 

 Mastogloia Smithii, Thw. 

 Encyonema prostratum, Ralfs. 

 caispitosum, Kiitz. 



4. Species collected at high elevations in the Auvergne. 



Epithemia rupestris, IV. Sm. 

 Eunotia Arcus, W. Sm. 



gracilis, W. Sm. 



— — tetraodon, Ehr. 



tridentula, Ehr. 



quaternaria, Ehr. 



quinaria, Ehr. 



Cymbella cuspidata, Kiitz. 

 Cocconeis Thwaitesii, W. Sm. 

 Surirella biseriata, Br^b. 



splendida, Kiitz. 



linearis, IV. Stn. 



Navicula rhomboides, Ehr. 

 — — rhynchocephala, Kiitz. 



