. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRANIAL MORPHOLOGY OF THE DIGYNODONT GENUS LYSTROSAURUS IJl soc PRO. Fig. II. Lystrosaurus sp. No. 11180. Braincase in anterior view. (Fig. 11) indicate the probable course of veins which drained the deep struc- tures of the head. The exact nature and extent of these blood-vessels is neces- sarily vague, but the following inferences can be made. The ventral surface of the paroccipital process is characteristically exca- vated between the fenestra ovalis and the distal end of the process. The d
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRANIAL MORPHOLOGY OF THE DIGYNODONT GENUS LYSTROSAURUS IJl soc PRO. Fig. II. Lystrosaurus sp. No. 11180. Braincase in anterior view. (Fig. 11) indicate the probable course of veins which drained the deep struc- tures of the head. The exact nature and extent of these blood-vessels is neces- sarily vague, but the following inferences can be made. The ventral surface of the paroccipital process is characteristically exca- vated between the fenestra ovalis and the distal end of the process. The dorsal surface of the stapes is similarly excavated and a clear-cut tunnel (Figs 14, 15: ) is thus formed, continuing forwards as a groove running anterodorsally over the ventral and anterior face of the prootic, in the direction of the facial foramen. The tunnel and groove are in the position of the lateral head vein of living reptiles (Goodrich, 1930; Dendy, 1909). The posttemporal fenestra is excavated in such a way as to form a channel running anteromedially from the occiput onto the face of the prootic. In one. 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
