As far as I am aware, there are not many Polacanthus cranial remains known, so it might be of interest to you that there should be a Polacanthus tooth in the collection of the Isle of Wight Museum of Paleontology (Dinosaur Isle). In ~1997 I found the tooth in the Chilton Chine conglomerate and donated it to the museum. This should be in addition to the specimen published in "Dinosaurs of the Isle of Wight" by Martill & Naish (eds. 2001).
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