﻿DR. J. MURIE ON THE THREE-BANDED ARMADILLO. 89 



an inguinal cremasteric band connected therewith. The superior and mferior extre- 

 mities of. the epididymis (globus major and minor) are each elongate and of good size. 

 There are no vesiculae seminales. 



2. Thoracic Tarts and Midriff. 



Eeart, Lungs, and Trachea.— No speciality is exhibited in the heart. 



The lungs are each three-lobed. The two anterior together are about equal in dimen- 

 sions to the posterior division. The middle lobe is narrow and remarkably elongate. 

 When the lung is inflated, it meets its fellow of the opposite side, and thus they encksp 

 the cardiac apex. The posterior lobe, when contracted, is short— though, under other con- 

 ditions, it must necessarily be considerably lengthened, and with an inward or semispiral 

 twist behind, to fit the thoracic pocket beneath the fleshy ligamentum arcuatum and 

 lesser muscle of the diaphragm. 



I counted fifteen soft flexible rings in the trachea, from the cricoid to the bronchial 

 fork. These do not meet behind. The tube altogether seems narrowest in the middle, 

 and slightly wider below. Its length is 1'3 inch: and each bronchus is less than 



\ an inch 



In Dasypus 9-cincfus, according to Owen \ Rapp ^ and Alessandrini ', there are but 

 two lobes to the left lung and three to the right, though the latter*s figures point to an 

 incision or semidivision of the sinistral upper lobe. The last-mentioned anatomist 

 demonstrates quadripartition of the right lung and a trifid left lung of 2). Q-cincfns ; but 

 in Owen's specimen there were three lobes on both sides. Chlamj/dophorus * agrees witli 

 the Peba in lung-segmentation. It has 16, the Encoubert 13, and tlie Peba from 18 to 

 22 tracheal rings. 



Fleshy Septa and action of Walls of Chest. — Eegarding the diaphragm, its construction 

 and attachments, though answering to what in common obtains among tlic greater 

 number of mammals, is yet worth separate mention on account of its being functionally 

 accessory to the visceral displacement during flexion of the trunk. There is a large 

 trefoil central tendon girdled by a fleshy plane with ordinary fastenings. The so-called 

 ligamentum arcuatum externum and internum run together ; and this backward exten- 

 sion of the greater muscle of the diaphragm is fleshy and not ligamentous. It extends 

 from the last rib rearwards to the diapophyses, parapophyses, and rudimentary transverse 

 processes of the two lumbar vertebrae behind that to which the posterior rib is partially 

 articulated. It is also inserted upon their bodies, and, by a narrow angular union with 

 the opposite moiety, leaves a small aortic opening. What corresponds to the lesser dia- 

 phragmatic muscle of human anatomy is thoroughly muscular in Tolypeutes ; and it 

 spinaUy mingles with the greater, as above described. Its left (and not the right) crus 

 is best developed, and proceeds beyond the oesophageal cleft, quite up to the inferior vena 

 cava. Indeed a few muscular fibrillse from it even appear to encircle that vessel. 



It is not a little remarkable that the representative of the quadratus lumborum muscle 



' ' P. Z. S. 1831, p. 143. 



S ( 



xaud 



' ilemoir I. c. p. 308, tab. xiii. fig. 7, and tab. xn. figs. 3 & 4. * Hyrtl, I. e. p. 45, pi. v. fig 



XXX 



N 



