Hood. 1 Cymbella proxima (6904) 2 Cymbella hantzschiana (6898) 3, 4 Cymbella designata (6898, 6906) [= Cymbopleura citriformis] 5 Cymbella sp. (6904) 6–10 Delicata canadensis (6898, 6904) 11, 12 Delicata delicatula (6904) 13 Cymbella aspera (6912). Scale bar: 10 µm.