I find myself unable to attach a species/genus name to the pair of trilobite pygidia I found in the Ibex area of Utah. The closest I can get is Ectenaspis judging from the form. The plate of two pygidia were found in the float of the Wah-Wah and Fillmore formations. They are weathered with some shell material, but not enough to see terracing or effacement. Found near the top of the ridge, they have to be Ordovican, but I can't be positive which formation it was situated. This genus is well know from the Maquoketa of Iowa and Decorah of Wisconsin, but I find no examples from elsewhere. A little help if someone has info. Thanks.