THE AMAZONS AND ITS TRIBUTARIES. 



131 



Odontidium tabellaria, W. Sm. 

 Orthosira punctata, IV. Sm., and 

 several forms of Eunotia. 



Pool on beach at Teffe. 

 Orthosira punctata, W. Sm. 

 Synedra radians, IV. Sm. 

 S. capitata, Ehrenb. 

 Navicula conops, Ehrenb. 

 N. appendiculata, Kuetz. 

 N. lcevissima, Kuetz. 

 Surirella linearis, W. Sm. 

 Diatoma elongatura, Ag. ? 



On leaves, Rio Mauhes. 

 Navicula rhomboides, Ehrenb. 

 Gompbonema lanceolatum, 



Ehrenb. 

 G. dichotomum, Kuetz. 

 Himantidium inajus, W. Sm. 

 Desmogonium guianense, Ehrenb. 

 Stauroneis anceps, Ehrenb. 

 Nitzscbia Victoria?, Grunow. 



Mud of Rio Mauhes, near Caxoeira 



de Portao. 

 Navicula rhyncocephala, Kuetz. ? 

 N. viridis, Ehrenb. 

 N. mesolepta, Ehrenb. 

 N . piscicuhis, Ehrenb. 

 N. major, Kuetz. 

 Gompbonema lagenula, Kuetz. 



Pool in Ygapo (i. e. forest or 

 brushwood under water for part 

 of the year) at Ooary. 



Navicula viridis, Ehrenb. 



N. binodis, Ehrenb. 



N. mesolepta, Kuetz. 



N. ampbirynehus, Ehrenb. 



N. angustata, W. Sm. 



N. nodosa, Ehrenb. 



N. Ililseana, Janisch. 



N. rhomboides, Ehrenb. 



N. Brebissonii, Kuetz. 



Gomphonema subtile, Ehrenb. 



G. lanceolatum, Ehrenb. 



Orthosira punctata, W. Sm. 

 Surirella panduriformis, W. Sm. 



Pools in sandbank, Rio Purus, 

 7° 35' S., 65° 22' W. 

 Navicula Perrotettii, Grunow. 

 N. bicapitata, Lagerst., var. 



major. 

 N. stauroptera, Grunow. 

 N. isocephala, Ehrenb. 

 N. mesotyla, Ehrenb. 

 N. Braunii, Grunow. 

 N. amphiceros, Grunow, var. 



parva. 

 N. affinis, Ehrenb., var. tropica. 

 N. viridis, Ehrenb., var. commu- 



tata. 

 N. firma, Kuetz., vars. tropica and 



dubia. 

 N. Brebissonii, Kuetz. 

 N. appendiculata, Kuetz. 

 N. semilunum, Grunow. 

 N. pachyptera, Ehrenb. 

 Stauroneis birostris, Ehrenb. 

 Schizostauron crucicula, Grunow. 

 Hantzschia brasiliensis, Grunow. 

 Nitzscbia palea, var. tropica, 



Grunow. 

 N.(Pseudotryblionella) Davidsoni, 



Grunow. 

 Actinella brasiliensis, Grunow. 

 Othosira punctata, W. Sm. 

 Amphora gracilis, Ehrenb. 



Paricatuba, Rio Purus, the 

 following : — 

 Navicula gibba, Ehrenb. 

 N. placentula, Ehrenb. 

 Gompbonema cristatum, Ralfs. 

 Ceratoneis Aicus, Kuetz. 

 Melosira varians, Ag. 

 Orthosira punctata, W. Sm. 



Lago Manacapuru, Rio 

 Solimoes. 

 Navicula tabellaria, Kuet z. 



