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Groupe F. — Nitzschiella, Rab. 



N. closterium, W. Sm. (Ceratoneis, Ehr.). — Marine, Celte (ascidie). 

 N. acicularis, W. Sm. (Synedra, Ktz. — Ceratoneis, Prilch.). — Eaux 



douces Toulouse, Pyrénées. 

 N. birostrata, W. Sm. (Ceratoneis longissima, Breb. — Nitzschiella 



longissima, Rab.). — Toulouse. 



Genre XXI. — Homœocladia, Agardh, 1827. 



H. filiformis, W. Sm. . . . Marine, Celte. 



H. Bulnheimiana, Rab. (Nitzchia, Grun.). — Eaux douces Toulouse, 

 H. sigmoidea, W. Sm. (Nitzchia fasciculata, Grun. — Nitzchia homœo- 



cladia, Heiberg.). — Submarine, Médoc. 

 H. vidovichii, Grun. . . . Marine, mousse de Corse. 



Genre XXII. — Bacillaria, Gmelin, 1788. 

 (Nilzcbia, Grun.). 



B. paradoxa, Gmel. (Nitzchia paxillifer, Heiberg. — Nitzchia para- 



doxa, Gr.). — Submarine, Cetle, Médoc. 



Genre XXIII. — Grunowia, Rab., 1864. 

 (Nitzchia, Grunow). 



G. tabellaria, Rab. (Denticula tabcllaria, Grun.). — Eaux douces Tou- 

 louse. 



Genre XXIV. — Ceratoneis. 



C. arcus (Ehr.), Ktz. (Eunolia, W. Sm. — Navicula, Ehr. — Cym- 



bella , Hassal. — Synedra gibbosa , 

 Pritch.). — Eaux douces Pyrénées. 



Genre XXV. — Tryblionella, W. Sm., 1853. 

 (Nitzchia, Grunow). 



T. circumsuta, Pritch. (Tr. scutellum, W. Sm. — Surirella, Bayley. 



— Submarine, Médoc. 



