. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. GIRDLES AND LIMBS OF THE PRISTEROGNATHID THEROCEPHALIA 135 Both tibia and fibula are lightly built, slender bones, lighter and slenderer than the radius and ulna. In both epipodials the pairs of bones are approximately of equal length. Proximally the tibia and fibula form a common terminal ai'ticular facet to meet the femoral condyles end on. Distally the tibia articulates with a rounded face on the astragalus and the fibula with an elongated facet on the proximal end of the Fig. 7. Diagr
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. GIRDLES AND LIMBS OF THE PRISTEROGNATHID THEROCEPHALIA 135 Both tibia and fibula are lightly built, slender bones, lighter and slenderer than the radius and ulna. In both epipodials the pairs of bones are approximately of equal length. Proximally the tibia and fibula form a common terminal ai'ticular facet to meet the femoral condyles end on. Distally the tibia articulates with a rounded face on the astragalus and the fibula with an elongated facet on the proximal end of the Fig. 7. Diagram of the pristerognathid epipodial and pes in dorsal view. AS —astragulus. CA—cal- caneum. C —central. F— fibula. T —tibia, tf—tarsal foramen. 1-5 —distals. I-V — metatarsals. As in pelycosaurs and therapsids generally the pristerognathid tarsus has a pair of proximal elements—an astragalus and a calcaneum. The astragalus is a robust, roughly ovoid bone with a rounded face for articulation with the tibia; laterally it has an elongated facet articulating with the calcaneum and distally a curved facet facing the centrale. The calcaneum is a larger but more lightly built bone. It is a sheet of bone, thickened proximally to form an elongated facet for the reception of the fibula. 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
