PLATE IX. 



Epithemia turgida (Ehr.), Kiitz, p. 294. 



Epithemia turgida, var. Westermanni, p. 295. 



Epithemia turgida, var. gramilata, p. 295. 



Epithemia turgida, var. Yertagus, p. 2P5. 



Epithemia Hyudmanni, Wm. Sm., p. 295. 



Epithemia Sorex, Kiitz, p. 295. 

 ' Epithemia gibba, Kiitz, p. 296. 



Epithemia gibba, var. parallela, p. 296. 



Epithemia gibba, var. ventricosa, p. 296. 



Epithemia Argus, Kiitz, p. 296. 



Epithemia Argus, var. amphicephala, p. 2S6. 



Epithemia Zebra (Ehr.), Kiitz, p. 296. 



Epithemia Zebra, var. proboscidea, p. 297. 



Epithemia Musculus, Kiitz, p. 297. 



Epithemia Musculus, var. constricta, p. 297. 



Epithemia gibberula, var. producta, p. 297. 



Eunotia Areus, Ehr., p. 299. 



Eunotia Arcus, var. minor, p. 299. 



Eunotia. Arcus, var. uncinata, p. 299. 



Eunotia Arcus, var. bidens, p. 299. 



Eunotia major (Wm. Sm.), Rab., p. 300. 



Eunotia major, var. bidens, p. 300. 



Eunotia gracilis, (Ehr.), Rab., p. 300. 



Eunotia exigua. Breb., p. 300. 



Eunotia pectinalis (Kiitz,), Rab., forma curta, p. 301. 



Eunotia pectinalis, forma elongata, p. 301. 



Eunotia pectinalis. var. ventricosa, p. 301. 



Eunotia pectinalis, var. undulata, p. 301. 



Eunotia Faba (Ehr.), Grun., p. 301. 



Eunotia tridentula, Ehr., p. 301. 



Eunotia praerupta, Ehr., p. 302. 



Eunotia praerupta, forma curta, p. 302. 



Eunotia praerupta, var. inflata, p. 302. 



Eunotia praerupta, var. bidens, p. 302 



Eunotia praerupta, var. bigibba, p. 302. 



Eunotia robusta, Ralfs., p. 303. 



Eunotia robusta, var. tetraodon, p. 303. 



Eunotia triodon, Ehr., p. 303. 



Eunotia lunaris (Ehr.), Grun., p. 303. 



Eunotia lunaris, var. subarcuata, p. 304. 



Eunotia lunaris, var. bilunaris, p. 304. 



Eunotia flexuosa, Kiitz, p. 304. 



Eunotia flexucsa, var. bicapitata, p. 304. 



