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Show 1904.] ON THE ANATOMY OF THE LACERTILIA. 465 there is no doubt as to which name should stand, for since no diagnosis was given by Heir Neumann in the Abstract (as published in ' Nature' and elsewhere), the delay in the issue of the November part of the ' Proceedings' until April 1, 1899, allowed abundant time for the German ' Sitzungsberichte' to be published. With regard to the generic name now used, it may be pointed out that Hippotragus (Sundevall, 1846 *) is antedated by Ozanna (Reichenbach, 1845), and that the latter name should be used by those who contend that Egocerus (Desmarest, 1822) is invalidated by yEgoceros (Pallas, 1811). But since the last-mentioned term is not in use, being a synonym of Ovis, and the alternative to Egocerus is the very objectionable name Ozanna, we are of opinion that this is one of the cases where a name need not be considered preoccupied unless its spelling is identical with that of its earlier rival. 2. Contributions to the Anatomy of the Lacertilia.-(2) On some Points in the Structure of Tupinambis. By F R A NK E. B E D D A R D , F.R.S., Prosector to the Society. [Received March 14, 1904.] (Text-figures 96-98.) The principal recent memoirs known to me which deal with the visceral anatomy of Tupinambis are those of Butler f, Hochstetter+, and Milani §. The two former deal almost entirely with the diaphragm, whilst the last-mentioned author describes the lungs and refers to previous observations (those of Meckel) upon the same organs. I myself deal in the following pages with a few anatomical facts which, so far as I am aware, are new. Aortic trunk.-The heart of Tupinambis resembles that of Iguana more than that of Tiliqua in its closeness to the liver. Moreover, the right and left aorta? trace a longer course before they join to form the common aorta. There are, in fact, in Tupinambis and Iguana three pairs of intercostals arising from the right aortic arch between the origin of the subclavian and the fusion of the aorta?, while there are only two pairs in Tiliqua. In the last-named genus the subclavians are concealed beneath the musculature for a considerable distance after their origin from the aorta; in Tupinambis, as in Iguana, these vessels are superficial and visible from their origin until where they plunge into * References to all these names will be found in Palmer's invaluable ' Index Generum Mammalium,' 1904. f " O n the Subdivision of the Body-cavity in Lizards, Crocodiles, and Birds " P. Z. S. 1889, p. 452. X " Ueber partielle und totale Scheidewandbildung, &c," Morph. Jahrb. ixvii. 1899, p. 263. § " Beitrage zur Kenntniss der Reptilienlungen," Zool. Jahrb., Anat. Heft vii. p. 646. |
