This part is the line of soft protoplasmic cells of the reteMalpighii.
2
We see that the horny laminæ are ingrowths of the reteMalpighii, ploughing into and excavating the corium into the shape of leaves-thesensitive laminæ.
3
The reteMalpighii rests on a plane corium; the rent in the section is along the line of the cells of the rete (Mettam).