On the Development of the Skeleton of the Tuatara Sphenodon Punctatis With Re
On the Development of the Skeleton of the Tuatara Sphenodon Punctatis With Re
G B Howes
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Tit. Cf. Pp. 87 & 113. VOL. Xvi. PART i. No. 5. February, 1901. F 34 PfiOF. G. B. HOWES AND ME. H. H. SWINNEETON ON THE of sternal ribs have been hitherto described for the adult, but we find that four pairs may be present, as, for example, in a skeleton in the Teaching Collection of the R. College of Science, Dublin. Similarly, in the developmental stages, four pairs may occur, as at PI. VI. Fig. 6 (Stage T), or four on the left side only, as at PL VI. Fig. 5, or on the right, as in specimens ...of Stage S in our possession. The earliest developmental stage of the sternum we have observed is at Q. In the section of this figured (PL VI. Fig. 4) but two ribs are seen to contribute to the sternum, but examination of serially related sections proves that the third enters also into its formation ; and, from what we have seen, we incline to the belief that when a fourth is present it also has contributed. In the latest stage figured, the organic continuity between ribs and sternum is still uninterrupted, the " incisurae costse " being of late origin.
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