Fig. 27

Isolated otoccipital neurocranium of A S. alberti; B A. occidentalis; in dorsal, ventral, anterior, posterior, and lateral views from top to bottom. aa, anterior ampulla; ascc, anterior semicircular canal; avc, anterior opening of the vidian canal; bo, basioccipital; bp, basipterygoid process; bsd, basicranial sesamoid; cal, crista alaris; cpro, crista prootica; crif, crista interfenestralis; crs, crista sellae; crt, crista tuberalis; fm, foramen magnum; fov, fenestra ovalis; hscc, horizontal semicircular canal; hvc, lateral head vein; inp, interparietal; ip, incisura prootica; ipr, inferior process of the prootic; la, lateral ampulla; lrst, lateral opening of the recessus scalae tympani; occ, occipital condyle; ocr, occipital recess; oto, otooccipital; pop, paroccipital process; pro, prootic; pscc, posterior semicircular canal; pvc, posterior opening of the vidian canal; so, supraoccipital; sopa, facet for the processus ascendens; sph, sphenoid; spht, sphenooccipital tubercle; st, sella turcica; trb, trabecula; VII, foramen of CN VII; X, foramen of CN X; XII, foramen of CN XII. Scale bars = 1 mm