166 THE AMERICAN" MONTHLY [May 



Navicula ainpbirhynchus, Ehr. 



" cuspidata, Kutz. 



'' gibba, Kutz. 



" pol3-onea, Breb. 



" inflata, Grun. 



" mesolepta, Ehr. 



" stauroneiformis, Lewis. 



" gigas, Kutz. 



" tumesceus, Gruu. 



" radiosa, Kutz. 



" gracilis, Ehr. 



" coluuinaris, Ehr. 



A Navicula verj- similar to figures of Navicula incompert^ Lewis, 

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

 mere or less abundantly found. 



Goniphonema capitatum, Ehr. 

 " olivaceum, Lyng. 

 *' acuminatum, var. coronata, Ehr. 



" vibrio, Ehr. 



" dichotomum, Kutz. 



• Achnanthes exilis, Kutz. 

 " subsessilis, Kutz. 



" lanceolata, Breb. 



PSEUDO-RAPHIDIEiE. 

 Eunotia praerupta, Ehr. 



" " var, monodon. 



" major, and vars. Rabb. 



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



" arcus, Ehr. 



'■ 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. 

 I^itzschia brebissonii, Kutz. 



" sigmoidea, Nitz. 



" amphioxys, Ehr. 



" spectabilis, Ralfs. 



