THE THICK-HEADED CERATOPSIAN DINOSAUR PACHYRHINOSAURUS (REPTILIA: ORNITHISCHIA), FROM THE EDMONTON FORMATION NEAR DRUMHELLER, CANADA

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Abstract
Pachyrhinosaurus, hitherto known from the lower Edmonton facies of the Lethbridge district in Alberta, Canada, has recently been discovered in correlative rocks in the Red Deer River valley, near Drumheller. An incomplete skull referred to Pachyrhinosaurus of. P. canadensis Sternberg is better preserved than others previously described. It reveals basic resemblances between this genus and certain ceratopsids (Centrosaurus: Styracosaurus) with short squamosals, deep faces, and wide uncomplicated narial apertures; the frill was fenestrated. Packyrhinosaurus is best placed in the Ceratopsidae, where it is unique in the possession of a massive nasofrontal boss in place of the usual nasal horn.

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