Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . a hemisphericalchamber anterior to which there is a prominent channel for the eustachian in SAM-K4610b the fenestra ovalis is visible, partially occludedon the right by the columella. Posteriorly the otoccipitals meet on the midlinedorsally (SAM-9946, K4603d) and fuse ventrally, forming the occipital condyles(SAM-K4610b). Small protuberances for cervical muscle attachment occur onthe posteromedial ends of the otic capsules (SAM-K4603d, K4609a). No fora-mina are visible. Columella The plectrum of t
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . a hemisphericalchamber anterior to which there is a prominent channel for the eustachian in SAM-K4610b the fenestra ovalis is visible, partially occludedon the right by the columella. Posteriorly the otoccipitals meet on the midlinedorsally (SAM-9946, K4603d) and fuse ventrally, forming the occipital condyles(SAM-K4610b). Small protuberances for cervical muscle attachment occur onthe posteromedial ends of the otic capsules (SAM-K4603d, K4609a). No fora-mina are visible. Columella The plectrum of the columella is shown in few specimens, but in SAM-K4610b it is visible ventrally, in natural position in the fenestra ovalis (seeFig. 2). A boomerang-shaped bone, it extends anterolateral^ from the fenestraovalis, then abruptly bends anteriorly and extends forward perhaps as far as theposterior tip of the maxilla (SAM-9965, although some forward displacementof the columella has taken place here). No trace of operculum is present. 56 ANNALS OF THE SOUTH AFRICAN MUSEUMPMX. PMX
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
