Quilly

The fabrick of the wing, as it appears through a moderately magnifying Microscope, seems to be a body consisting of two parts […]; the one is a quilly or finny substance, consisting of several long, slender and variously bended quills or wires, something resembling the veins of leaves […].

[…] sometimes you may even run across a quilly ball lying right on top of the ledge, or catch one of the numerous porcupine family picking its way leisurely among the rocks.