Maximum length/width (mm) plot of the anterior plastral lobe in Boremys pulchra Lambe, 1906a specimens (Brinkman and Nicholls 1991: table 2). Values are provided in Table 1. All measurements, except RAM 27109 (in red), are from specimens collected in Dinosaur Provincial Park, Alberta (Dinosaur Park Formation, middle Campanian). For the dotted blue regression line, R2 = 0.5246.