18/8.] MR. A. H. GARROD ON TOLYPEUTES TRICINCTUS. 227 



tremity. It does not, therefore, turn round the posterior end of the 

 hemisphere to become continuous with the fissure of the hippocam- 

 pus, as it does in Dasypus sexcinctus. Anteriorly it ceases in the 

 middle of the superior surface of the frontal lobe, a short distance 

 behind the convex margin of its upper moiety, and at about the 

 transverse level of the ends of the anterior sulcus. The general 

 direction of this sulcus is horizontal when viewed from the side, it 

 being slightly curved, with its convexity downwards. 



The sulcus present on the superoparietal cerebral surface of Dasy- 

 pus sexcinctus is entirely absent in Tolypeutes tricinctus. 



The internal cerebral surface very closely resembles that of Dasy- 

 pus sexcinctus as figured by Prof. Turner. The corpus callosum is 

 short, pointed in front, inclined obliquely upwards and backwards, 

 being rounded and thick posteriorly, where it becomes continuous 

 with the psalterium of the fornix. The anterior commissure is well 

 developed. The sides of the corpus callosum are very much 

 upturned. The calloso-marginal sulcus is feebly represented, being 

 of about the length of the corpus callosum, and situate at a level a 

 little anterior to it (vide fig. 2, d). 



The corpora quadrigemina are large, and separated by a deep lon- 

 gitudinal fissure, the pineal gland being extremely small. In the 

 natural position of the spirit-preserved specimen it was quite impos- 

 sible to cover the testes by the posterior margins of the cerebral 

 hemispheres, which leads me to think that Prof. Turner is hardly 

 justified in his correction of Tiedemann, Cruveilhier, and Stannius, 

 who all say that the corpora quadrigemina are uncovered by the 

 cerebrum (in part at least) {vide fig. 2 a). 



The median and lateral lobes of the cerebellum are nearly equal in 

 size. The medulla is very large, and the fifth nerve is enormous. 

 The optic nerves and commissure are insignificantly small. I could 

 not see any corpora albicantia. 



With reference to the visceral anatomy of Tolypeutes tricinctus, 

 the tongue was 2| inches long in my specimen, and *4 inch broad at 

 the base. It is soft and elongate-triangular (lanceolate) in shape, 

 flattened above. No circumvallate papillae are visible, the others 

 being inconspicuous and uniformly distributed. On the palate 

 there are nine larger and smaller transverse ridges on each side, the 

 interval between the last pair of molar teeth being smooth. The 

 number of teeth is eight above and seven below, on each side. 



The epiglottis is slightly indented by a notch in the middle line ; 

 and the soft palate embraces it, so that the rima glottidis opens into 

 the posterior nares, as in so many mammals, during ordinary respi- 

 ration. A tousilitic pit exists on each side of the fauces. 



The lungs are divided into four lobes on the right side, and two 

 on the left. In most Dasypodidae there are three lobes on the left 

 side ; but in the animal under consideration the two upper were 

 blended. Three is said by most authors to be the number of lobes 

 of the right lung ; but I always find a fourth azygos lobe as well, 

 hidden behind the heart, in the genera Dasypus and Xenurus, absent 

 in Tatusia. Dr. Murie's figure of the lungs scarcely differs, ex- 



15* 



