dorsal surface of the body of the axis, a line of cartilage was seen running transversely across just behind the level of the anterior articular facets ; this evidently corresponded to an inter-vertebral dise, and it is interesting to notice that, if the two parts of the bone had been separated here, the anterior would have corresponded very closely to the odontoid bone of Ornithorhynchus.In the older specimen of Petrogale with which I compared my own there was no indication of this separation, but in the disarticulated skeleton of a young Labillardiere's Wallaby the two parts of the axis were quite separate.1896.
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F. G. Parsons (1896) studied this question.