Colours seem wrong for Cyathus stercoreus. Outside usually brown for that species, whereas these appear more tan. Though most notablly the interior should be dark. No apparent striations so rules out C, striatus. Whitish interior suggests it looks closer to C. olla.
Seems to match some of the on-line images for C. olla, but then who knows if they have all been correctly identified? Bit of a minefield trying to match photos to IDs on the web. But if you think it is worth adding that species to our list I can do so. Probably only got stercoreus on there so far.
Wrong, that was novae-zelandiae. I've added striatus and olla. I found a good source of info: http://qldfungi.org.au/?s=Cyathus+olla&searchsubmit= It says only stercoreus grows on manure, with the rest on wood material or leaf litter, which suggests that mine might be stercoreus after all?