text-fig. 16. Ventral view of the braincase, showing different states for characters 56 and 57. a, basal ornithischian Lesothosaurus diagnostics; based on Sereno (1991b). B, Syntarsus rhodesiensis based on QG 195; the postorbital processes of the laterosphenoid are broken in this specimen of Syntarsus; their attachments are placed above and slightly posterior to the trigeminal foramen. Abbreviations: boc, basioccipital; bpt, basipterygoid process; bsp, basisphenoid; bspr, basisphenoid recess; bt, basal tuber; fo, fenestra ovalis; Is, laterosphenoid; oc, occipital condyle; op, opisthotic; pop, paroccipital process; popls, postorbital process of the laterosphenoid; psp, parasphenoid; Roman numbers refer to the foramina for the exits of cranial nerves. Scale bars represent 10 mm. in The interrelationships and evolution of basal theropod dinosaurs