. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 424 Annals of the South African Museum. in association witt the larger skulls, has a pair of small tusks. We may thus conclude that both sexes in the adult condition are tuskless as we find in Dicynodon platyceps. Perhaps the most striking character of Dicynodon vanderbyli is the deep hollowing out of the preparietal region. All sections across the orbits show the orbital margins much everted and the frontal region irregularly concave, though slightly raised in the middle line. A section across the m
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 424 Annals of the South African Museum. in association witt the larger skulls, has a pair of small tusks. We may thus conclude that both sexes in the adult condition are tuskless as we find in Dicynodon platyceps. Perhaps the most striking character of Dicynodon vanderbyli is the deep hollowing out of the preparietal region. All sections across the orbits show the orbital margins much everted and the frontal region irregularly concave, though slightly raised in the middle line. A section across the middle of the preparietal cuts on each side a very prominent ridge formed along the suture between the frontal and the postorbital, and the preparietal lies 10 mm. below the tops of the ridges. The postfrontal is a small bone wedged in between the frontal and the postorbital. The postorbital is unusually large. It forms a very prominent outstanding postorbital margin, and on passing backwards forms the whole of the upper temporal margin. Between the two postorbitals the parietals ap- pear as if much crushed, and only a small part of each ap- pears on the upper surface. The horizon of Dicynodon vanderbyli is probably about the middle of the Cistecephalus Dicynodon ivihnanae sp. nov. This new species is founded on a small skull discovered by me on the side of the high mountain about 2^ miles east of Biesjespoort station and probably about 500 feet above the horizon of the station. As the station is as near as may be at the top of the Endothio- don zone, this new species may be regarded as being situated about 500 feet up in the Cistece- phalus zone. The only Dicynodon which it resembles is Dicynodon mustoi, but as this latter is certainly from the middle of the Endothiodon zone, 1000 feet must separate the two allied forms. Fig. 3.—Skull of Dicynodon wilmanae. Broom. About h natural Please note that these images are extracted from scanned page images that may have
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
