I think the most likely answer is a calliphorid puparium. A bluebottle's sense of smell will guide it to potential food sources, even bricked-up cats. Tony Irwin
Dr A.G.Irwin 47 The Avenues Norwich Norfolk NR2 3PH England mobile: +44(0)7880707834 phone: +44(0)1603 453524 On 15 February 2017 at 10:42, BLAKE, CHELSEA E. (Student) < chelsea.e.bl...@durham.ac.uk> wrote: > Hi all, > > I have recently taken this off a desiccated cat found in a mansion wall. I > have found evidence of Black Carpet Beetle larvae elsewhere on the cat, but > have been unable to identify this sample. It is somewhat conical with a > domed top, smooth on the outside but with banded ridges on the interior. > > > Thanks for any help! > > Chelsea >