. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . bear a slight resemblance tothe less extensive canals present on the dorsolateral margin of the prefrontals ofSphenosuchus acutus (Walker 1990). The lateral edge of the dorsal part of the prefrontal is thickened, particularlyposteriorly, to form a prominent overhanging brow. Running longitudinally on theposteroventral part of this ridge is a narrow groove, clearly seen in BMNH R3592(Fig. 8B) and BPI 5207 (Fig. 2). Ventrally, this thickened area of bone ends in an abruptstep marking the lateral limit of a pronounced
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . bear a slight resemblance tothe less extensive canals present on the dorsolateral margin of the prefrontals ofSphenosuchus acutus (Walker 1990). The lateral edge of the dorsal part of the prefrontal is thickened, particularlyposteriorly, to form a prominent overhanging brow. Running longitudinally on theposteroventral part of this ridge is a narrow groove, clearly seen in BMNH R3592(Fig. 8B) and BPI 5207 (Fig. 2). Ventrally, this thickened area of bone ends in an abruptstep marking the lateral limit of a pronounced depression on the ventral surface of theskull roof in the area of nasal, frontal and prefrontal contact (Figs 7A, 8C). The prefrontal pillar forms the anterior border of the orbit and articulates with thelacrimal. Its ventromedial extent is currently unknown. The frontals (Figs 2, 7, 8) exist as paired, unfused elements forming the major part ofthe skull roof. They are broad posteriorly and narrow anteriorly, where long interdigitating 20 ANNALS OF THE SOUTH AFRICAN MUSEUM. B
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
