FIG. 9. Paedotherium MLP unnumbered2 in The Serrialis Bone, Interparietals, "X" Elements, Entotympanics, And The Composition Of The Notoungulate Caudal Cranium

FIG. 9. Paedotherium MLP unnumbered2, stereopair views of isolated left auditory region (with keys) in lateral (A) and medial (B) aspects. Both to scale in A. Shading convention as in figure 8. Specimen not in life position (see fig. 8B for proper orientation). This specimen, evidently adult, is relatively complete except for loss of thecal spine (single asterisk in A) and damage to exoccipital. Many features can be identified that are otherwise very difficult to see in intact skulls. Sutural divisions can be detected where expected in most areas; however, squamosal and ectotympanic are smoothly continuous (probable position of boundary indicated by question marks). Ectotympanic probably forms most or all of meatal roof; entotympanic participation has not