I, The sub-anal tract of the large nephridium given off near its papilla and seen through the unshaded smaller nephridium.
- Morphology of an Insect: the embryo of Gryllotalpa, somewhat diagrammatic. The longitudinal segmented band along the middle line represents the early segmentation of the nervous system and the subsequent median field of each sternite; the lateral transverse unshaded bands are the lateral fields of each segment; the shaded areas indicate the more internally placed mesoderm layer.
4), and covering all except the portion indicated by the unshaded circle.
The unshaded area gives the position of the shell-valve.