﻿DR. J. MURIE ON THE THREE-BANDED ARMADILLO. 79 



Isthmus of Skinfolds. — That which in the table of measurements is spoken of as the 

 isthmus, is a fold of integument which passes obliquely, like a kind of diaphragm, from 

 the region of the penultimate and antepenultimate rib to the first, second, and third 

 movable zones and the pelvic shield. This fold of integument forms the front wall of 

 a chamber which reaches to the middle line of the back above, in the dorsal and lumbar 

 regions, and to the summit of the ilium at the point of junction with the carapace. It 

 is bounded behind by the junction of the ischium with an inward process of the pdvic 

 shield; and by the last-named structures it is separated from the caudal chamber. 

 , Chamber for withdrawal of Hind Limbs. — Just as the inner wall of the chamber for the 

 anterior limb was formed for the shoulder, so this chamber for the posterior limb is 

 bounded internally by the posterior wall of the thorax, the lateral ^valls of the abdoiiuii, 

 and the lateral walls of the pelvic region. This inner boundary is not nearly so hm'ry ns 

 in the case of the anterior chamber, there being far fewer scales and only shorter and 

 scantier hairs. The inner lining of the outer wall, formed by the intcgunicnt of the 

 pelvic shield, appears to be absolutely smooth, except towards the lower aperture of the 

 chamber, where a few scales extend upwards in continnntion of the pelvic shield. 



Tail-chamber. —BQtwQQn the two last-mentioned chambers on each side there ia a sort 

 of chamber for the root of the tail, bounded at the sides by the integumcut covering the 

 conjoined ischii and process of pelvic shield, and above by the termination of the pelvic 

 shield, which forms a kind of arch l"-3 wide. Longish hairs fringe the iiif('gument 

 where it passes from the underside to the lateral boundaries of this chamber. 



4. Tegumentary Aspect of Head and Feet. 



Skin of Head.—TliQ integument of the head beneath the shield has no bony scutes 

 under the eye or elsewhere. On the snout the hairs are short and scanty for the most 



IS a 



part; but upon .the sides of the cheeks, lower jaw, and partly gular region, ihon 

 great number of small bony plates, with thin convex borders, whicli project forwards ; 

 and from these long brown hairs proceed. The extremity of the snout, between the 

 nostrils, is smooth and bald. The nostrils themselves are completely terminal, and tlu' 

 septum narium is only 0"'07 at its narrowest. Each nostril is about 0"-7 wide, and is 

 almost divided into two passages by a fold of integument proceeding from the outer 

 wall of the nose downwards and inwards. 



The Uar.~The concha of the ear is Yery remarkable, forming a kind of funnel, the 



of which naturally fold upon themselves along a line directed from above 



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obliquely downwards and forwards. The concha thus comes to have au anterior 

 division and a posterior lobe. The anterior lobe is not quite as broad as the posterior 

 one when the two are folded to-ether, the latter overlapping it by 0"-lC. ^^ hen the 



the mar 



two lobes of the ear are completely spread out, it presents an oval exi)ansion, 

 of which is slightly notched at the two lines of folding. Tlie proper aperture of the 

 meatus auditorius Hes between the anterior and posterior folds, and is a narrow elongated 

 sHt about 0"-2 in length. The posterior lip of this slit rises into an undulatmg ndgt^ 

 ^^ich is continued down to the lower margin of the posterior lobe. The anterior l,p i« 



