These seem to be illustrations of Burgess Shale organisms, Burgess Shale being renowned for the excellent preservation of soft tissues in its fossils, so the bubbly bits were actually quite well preserved, if maybe a bit squished and deflated.

Thanks. I looked it up.

You saying these are bugs tickles my funny bone imagining a metre long anomalcaris scuttling out from under the fridge, like a scene from a Cronenberg movie.