. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 200 ANNALS OF THE SOUTH AFRICAN MUSEUM border and is almost straight. The fusion of the two bones and the medial extent of the dorsal process are not allosauroid but are similar to Dilophosaurus and Ceratosaurus. Halticosaurus lilienstemi (Knollenmergel, Norian, of Thuringia) has a primi- tive astragalus, with the calcaneum solidly fused into an astragalocalcaneum. The two bones are 79 mm wide anteriorly, the astragalus 65 mm. The dorsal process is 42 mm high and dips medially n°, the H:B index is 65
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 200 ANNALS OF THE SOUTH AFRICAN MUSEUM border and is almost straight. The fusion of the two bones and the medial extent of the dorsal process are not allosauroid but are similar to Dilophosaurus and Ceratosaurus. Halticosaurus lilienstemi (Knollenmergel, Norian, of Thuringia) has a primi- tive astragalus, with the calcaneum solidly fused into an astragalocalcaneum. The two bones are 79 mm wide anteriorly, the astragalus 65 mm. The dorsal process is 42 mm high and dips medially n°, the H:B index is 65. The dorsal. I QHh 0 6 Fig. 5. Halticosaurus lilienstemi, type. Anterior view of left astragalus and distal end of tibia. x h process is thick (16 mm) and in lateral view the entire element, including the dorsal process, is almost circular, measuring 46 mm anteroposteriorly. The type of Dilophosaurus wetherilli (UCMP 37302) has an astragalus 91 mm broad anteriorly and but 76 mm broad posteriorly. In anterior view the dorsal process is 70 mm high above a straight line across the base (H:B index 76), 14 mm thick at mid-height, and shows little if anv bearing surface. It begins at the median border and rises in a uniform slope of 160 to about 20 mm from the summit where the slope increases to give a total slope of 270. The anterior condylar surface is concave transversely, and rounds below into a medial condyle and a lateral condyle that continues onto the calcaneum. There is a slight transverse groove in the centre of the rounded medial edge. The anterodorsal border of this surface projects forward and is separated from the dorsal process by a broad upper horizontal groove that deepens laterally and terminates at the fibular socket. The rounded anterolateral projection of the astragalus forms the anterior border of the fibular socket. About half of this socket is in the astragalus. A rounded buttress runs down the anterolateral corner of the dorsal process and extends onto the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
