228 MR. A. H. GARROD ON TOLYPEUTES TRICINCTUS. [Feb. 19, 



cept in the absence of division of the left upper lobe, from my speci- 

 men. 



The stomach is of the ordinary shape, with but a short lesser cur- 

 vature. 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 bas 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 me 1 , the 

 formula of the bulk of the lobes is thus expressed : — 



L.L. li>R.C>R.L. 2>L.C. 2>C. 



The small intestines measure 75 inches, the large intestine 6 5 

 inches. There are no cseca ; but there is an abrupt change in the 

 diameter of the alimentary canal at the ileo-ceecal 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 ex- 

 treme 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- 

 podidse I may refer to Hunter's description of Tatusia peba 2 , Pro- 

 fessor Owen's account of the same species, and of Dasypus sexcinc- 

 tus 3 , and Hyrtl's monograph of Chlamydophorus truncatus 4 . To 

 these I may add my 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 Toly- 

 peutes. 



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 vil- 

 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 tri- 

 cinctus. 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 

 there 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 Denksckr. der kais. Akad. Wien, ix. 1855. 



