Van Heurck -- Synopsis des Diatomées de Belgique -- Index
| Pyxilla ?? | aculeifera Grunow | Page -- | Plate 83 | Figure 13,14 | Note 199 |
| Pyxilla ?? | aculeifera var.? [Grunow] | Page -- | Plate 83bis | Figure 5 | |
| Pyxilla | americana (Ehrenb.) Grunow | Page -- | Plate 83bis | Figure 1,2,3 | |
| Pyxilla ? | baltica Grunow | Page -- | Plate 83 | Figure 1,2 | |
| Pyxilla | baltica var. [Grunow] | Page -- | Plate 83bis | Figure 4 | |
| Pyxilla ? | carinifera Grunow | Page -- | Plate 83 | Figure 5,6 | |
| Pyxilla ? | dubia Grunow | Page -- | Plate 83 | Figure 7,8 | |
| Pyxilla | dubia var. [Grunow] | Page -- | Plate 83bis | Figure 12 | |
| Pyxilla ?? | kittoniana Grunow | Page -- | Plate 83bis | Figure 9,10,11 | |
| Pyxilla ?? | kittoniana Grunow | Page -- | Plate 83 | Figure 10,11 | |
| Pyxilla ?? | subulata Grunow | Page -- | Plate 83bis | Figure 6 | |
| Pyxilla ? | variabilis Grunow | Page -- | Plate 83 | Figure 3,4 |