Which preposition to use with carapaces

in Occurrences 1%

There was Indian-corn standing, but I saw no pumpkins warming their yellow carapaces in the sunshine like so many turtles; only in a single instance did I notice some wretched little miniature specimens in form and hue not unlike those colossal oranges of our cornfields.

of Occurrences 1%

So it is under the carapace of Back Cup that Count d'Artigas has established himself!

Which preposition to use with  carapaces