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Show 1905.] ON THE VASCULAR SYSTEM OF HATTERIA. 4 61 7. Some Additions to the Knowledge of the Anatomy, principally of the Vascular System, of H a t t e r ia , C ro c o - d ilu s , and certain Lacertilia. B y F r a n k E. B ed d a rd , M .A ., F.H.S., Prosector to the Society. [Received June 5, 1905.] (Text-figures 59-69.) (1) On some Points in the Vascular System of Hatteria, p. 461. (2) Notes on certain Veins in the Crocodile, p. 466. (3) Notes on the Vascular System of Ophisaurus, p. 468. (4) On the Anatomy of Amphisbeena brasiliana, particularly of the Vascular System and the Mesenteries, p. 479. (1) On some Points in the Vascular System of Hatteria. It is a noteworthy fact that, apart from the absence of a copulatory organ, hardly anyone has attempted to utilise the disposition of the internal viscera of Hatteria in order to show its primitive, or at any rate isolated, position in the series with regard to other Sauropsida. So far as I am aware, the only internal feature in which Hatteria has been alleged to be primitive is in the equal development of the internal surface of the lungs from end to end, there being no trace in this Sauropsidan of the partly or wholly anangious region at the caudal extremity of the lung found in Lizards *, and, of course, especially in Snakes. On the other hand, Osawa f has lately used the internal viscera to emphasise the likeness between Hatteria and the Lacertilia, especially even the Agamid Lacertilia. It is, in fact, agreed on all hands that the viscera of this reptile are not widely different from those of Lizards. The absence of a penis could hardly be alleged to be primitive ; it would rather seem to be a specialisation. The vascular system of this reptile does not appear to me to have been much investigated. Osawa, in his otherwise exhaustive survey of the structure of Hatteria, has nothing to say of the blood-vessels. Hochstetter J, however, has given some details concerning the intestinal arteries, quoting an earlier paper by Klaatch §. In the long bibliography given by Messrs. Howes and Swinnerton ||, which includes references to papers dealing with " soft parts," as well as with skeleton, I can find no memoir quoted which refers to the vascular system. I am able therefore, as I hope, to add something to our knowledge of this system of organs in Hatteria, and to furnish additional evidence towards the settlement of the much-vexed question of the place of Hatteria in the system. * Milano, Zool. Jalirbuclier (Abth. f. Anat.), vii. p. 545, f Arch. f. mikr. Anat. Bd. xlix. p. 113. X Morph. Jahrb. vol. xxvi. p. 217, pi. v. fig. 1. § Ibid. vol. xviii. II Trans. Zool. Soc. vol. xvi. p 1. |