. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. i68 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 7. LystTosaurus declivis. No. Frontotrans- verse section through basicranial axis and skull roof. only a shallow fossa in the Dinocephalia, while Camp & Welles (1956) state that the fossa is absent in the Triassic Kannemeyeria, Placerias and Stahlekeria. This lends support to Olson's (1944) view that the fossa decreased in depth and importance during the course of therapsid evolution. The vestibule, lying between the opisthotic, prootic

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. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. i68 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 7. LystTosaurus declivis. No. Frontotrans- verse section through basicranial axis and skull roof. only a shallow fossa in the Dinocephalia, while Camp & Welles (1956) state that the fossa is absent in the Triassic Kannemeyeria, Placerias and Stahlekeria. This lends support to Olson's (1944) view that the fossa decreased in depth and importance during the course of therapsid evolution. The vestibule, lying between the opisthotic, prootic and basioccipital, opens into the sacculo-cochlear recess, which in turn communicates widely with the cranial cavity through the internal auditory meatus. Olson (1944) states Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky