﻿110 



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



Serrati -The s. magnus is strong. Attachments nine anterior ribs, transverse pro^ 

 cesses of two or three postcemcals, and, as usual, scapula. There does not appear to 

 be an s posticus superioris ; and the s. posticus inferioris might be taken for a contiuua. 

 tion of 'the latissimus dorsi. It arises by fascicular tendons from the metapophyses of 

 the last three dorsal and 1st lumbar vertebrae ; and its muscular insertion is into the 3rd 

 and 4th hindmost ribs. Damjpus 6-cmcfus has a double s. magnus, one to 1st and 2iid 

 ribs, the other to 3rd to 6th cost« (Galton) ; Chlamydoj^horus 8 front ribs, and united 



to levator scapulae (Hyrtl). . ,. ^ w 



The Latissunus dorsi and dorsi epitrochlear muscles bear intimate relations. One sheet 



of this associated duplex muscle is interwoven with the rhomboidei and with the posterior 



serratus, and comes from the 6th to 9th dorsal spines. As it Avinds over the posterior 



an^le and the scapula, its fibres become distinct from those of the rhomboidei, and have 



an'^attachment to the inferior (posterior) border of the scapula, at the middle blending 



with the scapular head of the triceps ; thence it descends to the olecranon region and 



fascia beyond. The second division springs fleshy from the posterior border of the 



scapula, m junction with the teres major ; but it also derives origin from the thorax, 5tli 



to 2nd ribs near their sternal ends. It is continued out to the shaft of the humerus, 



terminating in a strong tendon. Described at greater length, and comprising lumbar 



fascia, the above pair of muscles are essentially alike in Dasyj^us and Cklamydophorus\ 



Cuvier's fiirures* are in concord with Galton's observations". Huxley's memoranda I 



ppend as a footnote 



5. Muscles of the Fore Quarters 



Pectorales.— From its comparatively great length, the p. major would seem to have 



more retractile than adducting power. It extends abdominally half an inch behind tne 



xiphoid cartilage, there narrow and tapering. It reaches forwards to the manubnum, 



but is meagre in costal attachment, though fastened to the inner clavicular cartilage and 



bone for about a third of its length. Its tendinous insertion is the inner edge of the 



prominent deltoid process, fascia continuing to the forearm. What may constitute a 



deep layer of the preceding, or, as lief, a pectoralis minor, is a long narrow strip, with an 



origin from the 5th and 6th sternal ribs. In trending outwards and forwards, it goes 



over the surface of the biceps, and there, weak and tenuous, is fastened in part on its 



tendon, while some fibres continue upwards towards the shoulder-joint. The preceding 



condition answers well to what is recorded of the pectorales in Chlamy dophorm . Huxley 



assigns a wide clavicular origin to the p. major in JDasypm sexcinctus, and describes a 



Hyrtl, I, c. p. 33. He tcrmB the two divisions « vertebral et costal." 



Rccueil,' pis. 259, 260. 



L.c. p. 531. 



* The notes of Prof. Huxley's dissection of D. sexclnctm ruu thus :— " The latissimus dorsi has an extraordinary 

 origin by a broadness of fibres, which arise near the junction of the sternal and vertebral ribs, interdigitating ^it^ 

 thoM of the Berratus and external obhqne-and an ordinary origin, which is exceedingly extensive, and where tie 

 fiDtcs converge, pass over, and become connected with the angle of the scapula. These latter are for the most part 

 coutmuou. ^th the very large ' dorsi epitrochlear,' which passes down on the back of the arm as a sort of accessoiy 

 ^tensor, and «i mserted partly into the fascia covering the olecranon, and partly into that which covers the flexor 

 (iTucUm^resr'^ ^^' ^^' ^"^' ^' '''* '* ^' "^^^'^^ Soes to the ordinary insertion into the humerus. 



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