Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . familyMelanorosauridae (as Plateosauravidae) by Huene (1956) and to the Anchi-sauridae (as Thecodontosauridae) by Romer (1966). The region of the dia-pophysis is slightly damaged (Fig. 13B, F) but from the adjacent curves of theneural arch (Fig. 13E) it is obvious that the diapophysis was very small and,as a result, this vertebra is from the anterior part of the series and is probablyeither the third or fourth cervical vertebra. It is proportionally very muchshorter than the equivalent vertebrae of Anchisaurus (Figs 9

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Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . familyMelanorosauridae (as Plateosauravidae) by Huene (1956) and to the Anchi-sauridae (as Thecodontosauridae) by Romer (1966). The region of the dia-pophysis is slightly damaged (Fig. 13B, F) but from the adjacent curves of theneural arch (Fig. 13E) it is obvious that the diapophysis was very small and,as a result, this vertebra is from the anterior part of the series and is probablyeither the third or fourth cervical vertebra. It is proportionally very muchshorter than the equivalent vertebrae of Anchisaurus (Figs 9H, 12B), Efraasia(Figs 91, 12A) and Plateosaurus (Huene 1926). The only prosauropods withcervical vertebrae proportionally as short are Thecodontosaurus (Fig 11 A) andLufengosaurus (Figs 9J, 12C) but in both cases the vertebrae are proportionallymuch lower, the neural spines are not so well developed and there is no pleuro-coel (exaggerated in Arctosaurus because of crushing). Arctosaurus osborni is AXCHISAURUS CAPENSIS (BROOM) AND A REVISION OF THE ANCHISAURIDAE 151 A B. —poz—

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