. Papers and proceedings of the Royal Society of Tasmania . ^.IHtsb- Labyrinthodont Humeri. BY W. H. TWBLVETREES AND W. F. PETTERD. 29 The articular surfaces of both ends are abraded, exposinguniformly cancellous structure of the osseous transverse section of the shaft shews a loose cancellouscharacter all through : the cancelli are coarser towards thecentre, but there is no medullary cavity as in the Onomo-dontia, Dinosauria, and other extinct reptilia, nor is thereany differentiation into peripheral bony wall and spongycancellated centre, as in some Permian reptiles. It is t
. Papers and proceedings of the Royal Society of Tasmania . ^.IHtsb- Labyrinthodont Humeri. BY W. H. TWBLVETREES AND W. F. PETTERD. 29 The articular surfaces of both ends are abraded, exposinguniformly cancellous structure of the osseous transverse section of the shaft shews a loose cancellouscharacter all through : the cancelli are coarser towards thecentre, but there is no medullary cavity as in the Onomo-dontia, Dinosauria, and other extinct reptilia, nor is thereany differentiation into peripheral bony wall and spongycancellated centre, as in some Permian reptiles. It is true,.Prof. Owen refers to a femur of Rhombopholis scutulatusas being hollow,* but it is not certain that Rhombopholiswas Indeed, verj few limb bones oflabyrinthodont amphibia have been determined : a glanceat the annexed list shews that the si3ecies and genera ofthe order have been always founded on vertebrte, jaivs andother parts of the skull. Hence, in discoveries of isolatedbones as those under review, caution is needed in drawingconclusions. Under
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