Figure 53. cf. simple triangle Winfrey, Doyle and Riedel 1987. 53.1.1. Tooth crown and base, GSC 124617. 53.2.1 and 53.3.1. Tooth crown showing arc-shaped inline, apical shadow, and a straight-across transverse line at the base of the crown, GSC 124618 and 124619. Scale bar = 0.2 mm.