| Antennae are multisegmented in neuropterans and filiform in Megaloptera and Raphidiodea. |
| The edges of the pyramids are formed by filiform bars similar to those which compose the original lattice-work of the Sagosphrida. |
| The filiform papill become elongated to several times their normal length, and feel and look like so many hairs on the tongue. |
| H are seen the long filiform external gills which now project out from all the visceral clefts, including the spiracle. |
| The filiform papillae are long and stained by accumulated debris. |
| Plants on this latter medium were very short with filiform leaves. |
