166 THE AMERICAN MONTHLY [May 



Navicula ainphirhyuchus, Ehr. 



" cuspidata, Kutz. 



'' gibba, Kutz. 



" polyouea, Breb. 



" inflata, Grun. 



" mesolepta, Klir. 



" stauroueiformis, Lewis. 



" gigas, Kutz. * 



" tumesceus, Grun. 



" radiosa, Kutz. 



" gracilis, Elir. 



" coluiunaris, Etir. 



A Navicula very similar to figures of Navicula incomperta, Lewis, 

 but somewhat more elongate, striation fine, probably a variety, is 

 mere or less abundantly found. 



Gomphonema capitatum, Ebr. 



" olivaceum, Lyng. 



" acuminatum, var. coronata, Ehr. 



" vibrio, Ehr. 



" dichotomum, Kutz. 



Aclinanthes exilis, Kutz. 



" subsessilis, Kutz. 



" lauceolata, Breb. 



PSEUDO-RAPHIDIE^. . 

 Eunotia praerupta, Ehr. 



" " var, monodon. 



" major, and vars. Rabb. 



" arcus, var. plicata, J. B and Fr. Heri. 



" arcus, Elir. 



" bidentula. 



" tridentula. 



" robusta, var. diadema, Ehr. 



Himanthidium pectinale, Kutz. 



" " var. minus. 



•' " var. undulatum. 



Synedra ulna, Ehr. 



" " var. vitrea. 



Meridion constrictum, Ralfs. 

 Tabellaria fenestrata, Kutz. 



" flocculosa, Kutz. 

 Sarirella craticula, Ehr. 

 Nitzschia brebissonii, Kutz. 



" sigmoidea, Nitz. 



" amphiox3-s, Ehr. 



" spectabilis, Ralfs. 



