FIG. 6 in The Serrialis Bone, Interparietals, "X" Elements, Entotympanics, And The Composition Of The Notoungulate Caudal Cranium

FIG. 6. Oldfieldthomasia cf. debilitata AMNH-VP 28600, left hemicranium, virtual parasagittal sections (for approximate locations see fig. 1A); rostral to right. All to scale in C. A and B, sections through lateral cranial wall and external acoustic meatus: single white asterisk, definite suture between rostral crus of ectotympanic and alleged element Xa; double white asterisks, fracture zone (not a suture) passing through mandibular