This week I have a detail from a specimen, to really test your deductive skills:
I suspect there isn’t really enough to work with here, so here’s a slightly less close up view:
Any idea what this might be? As always, you can pop your thoughts, questions and suggestions in the comments box below!
Zygoma 
Well, if you just used the first photo you might be up a certain creek without a paddle.
But the second photo reveals many teeth.
Who collected it, Polly O’Dann?
without seeing my comps in person, i guess i have to keep digging my hole deeper.
To split the difference between two possible choices you might go with a spatula, or you might cut sharper (or bigger?) with a gladius?
I’m with Adam on the identification: translate “many teeth” into Greek if you have trouble with his hint. … The photos I have found on the WWWeb of the rostral skeleton of this animal show it in a more thoroughly de-fleshed (?) state: it’s a complicated 3-dimensional structure of struts in various orientations, meeting at starlike junctions. (Buckminster Fuller on steroids!) Paolo’s photo seems to show some of the star-junctions as close to the surface, appearing on it when the surrounding matrix ?? shrinks with drying ??
Fascinating creature, fascinating photo!