Certainly this resembles a rough sketch of the future wing-case; but how different from the mature structure!
Shard, shrd, n. a fragment, as of an earthen vessel: the wing-case of a beetle.
On the right side of the body, in fig. 3, the wing has been folded up, and is covered by the wing-case.
The instrument by which it produces its music is contrived out of the ordinary nervures of the wing-case.
Here was the hind-leg of one of the smaller beetles, there the wing-case of a flying creature.