The colour and softness of the material are the same in both cases; but the shape is quite different.
The stolen object is a globe; the object presented in exchange is an elliptical conoid studded with angular projections along the edge of the base.

The Spider takes no account of this dissimilarity.

She promptly glues the queer bag to her spinnerets and is as pleased as though she were in possession of her real pill.

My experimental villainies have no other consequence beyond an ephemeral carting.

When hatching-time arrives, early in the case of Lycosa, late in that of the Epeira, the gulled Spider abandons the strange bag and pays it no further attention.
Let us penetrate yet deeper into the wallet-bearer's stupidity.