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Show 228 MR. A. H. GARROD ON TOLYPEUTES TRICINCTUS. [Feb. 19, cept in the absence of division of the left upper lobe, from my specimen. The stomach is of the ordinary shape, with but a short lesser curvature. It is muscular, but not powerfully so, at its pyloric end. Along its greater curvature, when laid out flat, it measures 6| inches. The liver has the lateral fissures deep, whilst the umbilical fissure is comparatively insignificant. The gall-bladder is partly, but not deeply, embedded in the abdominal surface of the right central lobe. The Spigelian lobe forms a short rounded cone, very broad at its base. According to the method elsewhere suggested by me1, the formula of the bulk of the lobes is thus expressed :- L.L. 1|>R.C>R.L. 2>L.C. 2>C. The small intestines measure 75 inches, the large intestine 6*5 inches. There are no caeca ; but there is an abrupt change in the diameter of the alimentary canal at the ileo-caecal valve, as in T. conurus and in the genus Tatusia. The uterus is triangular, the fundus being perfectly straight when viewed from in front, and the Fallopian tubes joining it at the extreme upper and outer angles. The conical clitoris is an inch long; and the genito-urinary orifice is a longitudinal slit 0*3 inch from its apex. Among the various papers on the visceral anatomy of the Dasy-podidae I may refer to Hunter's description of Tatusia peba2, Professor Owen's account of the same species, and of Dasypus sexcinctus' 6, and Hyrtl's monograph of Chlamydophorus truncatus*. To these I may add m y own notes on Xenurus unicinctus, together with those upon the other species which have passed through my hands, as an assistance towards the determination of the affinities of Tolypeutes. In Xenurus unicinctus the gall-bladder is so deeply embedded in the tissue of the right hepatic lobe that it nearly penetrates to its diaphragmatic surface. This I find to be the case in Dasypus vii-losus, D. sexcinctus, and D. vellerosus; whilst in Tatusia hybrida and Tolypeutes tricinctus it is much less sunk. The cystic duct is very much twisted in a corkscrew manner. The proportional bulk of the hepatic lobes is almost exactly the same as in Tolypeutes tricinctus. In Tatusia peba and T. hybrida the right central lobe is the largest, not the left lateral. In Tatusia the umbilical fissure is less significant than in Dasypus, Xenurus, or Tolypeutes. The junction of the large and small intestines in Xenurus is as in Tatusia peba and T. hybrida, there being no csecal dilatations, as tbere are in Dasypus villosus, D. sexcinctus, D. minutus, and D. vellerosus. The following measurements of the intestines demonstrate their relative lengths :- 1 P. Z. S. 1875, p. 57. 2 'Essays and Observations on Natural History,' 1861, vol. ii. p. 182. 3 P. Z. S. 1831, pp. 141 and 154, and P. Z. S. 1832, p. 130. 4 Denkschr. der kais. Akad. Wien, ix. 1855. |
