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



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p. minor— that also referred to by Meckel, but which doubtless is the subclavius \ 

 Cuvier's sketches rather reciprocate my determination. Galton's observation, echoed by 

 Macalister, points to absence of a p. minor and of clavicular origin to the p. major. The 

 ensiform origin in the " Tatu " Meckel ascribed as influencing respiration during the 

 rolling up of the body K In Tolypeutes it doubtless deflects the xiphoid segment, but 

 that to give stowage-room to the abdominal viscera, the assistance to respiratory function 

 probably being a sequence. 



A distinct subclavius arises from the expanded end of the first rib, close to the stemum. 

 It passes under the clavicle, is connected to that bone and to the deep cervical fascia, 

 being finally inserted upon the tendinous arch between the coracoid and acromion. 

 Hyrtl recognizes it in his monograph ' ; but it has been mistaken by others, as mentioned, 

 for a p. minor, though Gait on has correctly appreciated its character ^ 



There is a supracostalis derived from the sternal end of the 1st rib ; thence it covers 

 the outer halves of the 2nd, 3rd, and 4th sternal ribs, extending beyond to the 5th, 6th, 

 and 7th by a thin glistening fascia. This, the sterno-costal muscle of Cuvier, I presum^^ 

 is the rectus thoracicus lateralis of Macalister ^ With the latter author, however, I do 

 not agree in recognizing it as a prolongation of the rectus abdominis. In its oblique 

 inward diagonal direction to that muscle, the fact that the rectus in many instances runs 

 beneath it with quite a separate first costal fastening, and the occasional presence of a 

 second external supracostal, we have similitude to additional though abnormal scalcni, or 

 to deep pectorales, rather than to extension and differentiation of the abdominal rectus. 



Humeral Extensors. — The deltoid has an extensive origin, partly from the outer half 

 of the clavicle, partly from the acromion process and scapular spine to its expansion, 

 thereafter mingling with the dorsal fascia. Meshy below, it is fastened to the outer 

 humeral neck and deltoid process, excepting what is occupied by the pectoraUs-mnjor 

 tendon. The scapular head of the triceps is very broad, one border, as already stated, 

 intermingling with dorsi epitrochlear. Its olecranal insertion is extensive, according 

 therefore with the enlargement of this ulnar process. The long humeral division of the 

 muscle is smaller than the preceding ; and the third shorter head has origin below the 

 teres major. Besides what may be regarded as an anconeus externus, there is a wnll- 

 marked and fleshy representative of an anconeus internus, the " epitroclilco-anconcus '* of 

 Prof. Wenzel Gruber \ The presence of the latter in D. Q-^inctm is attested by Curler • 

 and Galton \ 



' MS. HuBterian Lectiires. " French ed. torn. yi. p. 372. ' P. 32, * L. e. p. 528. 



• Ann. Mag. N. H. July ] 869, p. 55. * -Reeneil, pL 260 u'. 



' Loc. cit. p. 539, pi. 44. fig. 2, e a. • • ir i 



• Mem. d. 1. Acad. Sci. d, St.-Petersb. torn. x. 1867. In his diseertation on this anomalous anconeus m Man and 

 animals, Gmber sp^ciaUy depicts that of the Three-banded Armadillo (^Dasijpus tridncttis), tab. ii. fig. 3, m u dissec- 

 tion of the right axilla and fore limb. He has given a foil description of the same (p. 20), which I quote at kngth 

 in his own words :-" Bedeckunglage.-Der muskel ist von dem latissimus dorsi kommenden auconcua fleischig bc- 

 deckt. Er Hegt zwischen dem triceps brachii, dem nur mit einem kopfe von der uka cntspnngcndcn dnans mt^rnu. 

 ^d dem epitrocHeua entspringenden muskeln im sulcus epitrochleo -anconeus iiber den nervus ulnans und uTjer einen 

 von dor medialen flache des olecranon entsnrineenden 6Kn. breiten und 3-4 lia. brciten floischkopf dos flexor d.g.- 



