FIG. 13 in The Serrialis Bone, Interparietals, "X" Elements, Entotympanics, And The Composition Of The Notoungulate Caudal Cranium

FIG. 13. Cochilius volens AMNH-VP 29651, stereopairs of left side of caudal cranium (with keys) in ventral (A), oblique ventrolateral (B), and dorsal (C) aspects, on this and subsequent pages. Shading convention as in fig. 8. Key to A and B: 1, squamoso-alisphenoid suture (preotic area); 2a/2b, squamoso-ectotympanic suture (incl. glaserian fissure; question mark indicates boundary in meatal area uncertain); 3, putative ectotympano-entotympanic suture; 4, exoccipito-ectotympanic suture; 5, petrotympano-squamosal suture (question mark indicates uncertain boundary); 6, squamoso-exoccipital suture (on paroccipital process). Key to C: 1, squamoso-parietal suture; 2, inferred squamoso-interparietal suture; 3, speculative reconstruction of parieto-interparietal suture (externally obliterated, actual confirmation unknown); 4, supraoccipito-(inter)parietal suture; 5, squamoso-zygomatic suture. In A, petrosal (asterisk) slightly exposed in basicapsular fissure due to