MR. J. C. GALTON ON DASYPUS SEXCINCTUS. 527 



The clavicular portion of the muscle is, moreover, wanting, according to Pfciffer 1 , in 



many Apes and Lemurs, in Bats, in the Hedgehog, Hyshix, and Arctomvs. 



The acromio-basilar is very distinct, and is fairly developed. It lakes origin from Hie 

 lateral ridge of the supraoccipital bone, and passes thence obliquely downwards and 

 outwards to be inserted tendinously into the strong downwardly din ted tubercle at tin- 

 base of the acromion — " metacromial process " of Parker . 



Not far from its termination it passes over that part of the occipital division of the 

 trapezius which is detached to join the fascia of the arm. 



Cuvier evidently considered this muscle to be a factor of the trapczi t, seein_ that it 

 is lettered by him in his plates 3 as its " portion cervicale." 



According to Meckel 4 the acromio-basilar, to which he has given no distinct desig- 

 nation, is to be regarded, either as a portion of the trap, riu*, or > a muscle mm generis. 

 The first of these views, he holds, receives support from the arrangement of the inn •!<• 

 in the Otter, in w T hieh animal it springs from the internal face of the trapezius — this 

 latter being consequently differentiate into an external and internal layer. Redoes 



not agree with Cuvier that it is a levator scapula carried far forward, because, 1, of its 

 coexistence with that muscle in all animals where it is pr sent ; 2, of its superficial 



position in the Makis and certain Apes. 



Church 5 found a representative of this muscle in the Orang; and Wagner, according 

 to Henle 6 , discovered in the human subject an accessory portion of the trofezius which 

 passed to the acromion from the mastoid process. 



Levator clavicula?.— A fairly developed muscle, which takes origin from the Btrou 

 fibrous aponeurosis covering the occipitoparietal region of the skull, immediately to the 

 outside of the origin of the preceding muscle. It then runs along close to the outei 

 edge of the cleido-mastoid, and parallel with it, and is inserted into the clavicle, just 

 external to the terminal portion of the muscle 



Cuvier gives a very fair representation of it on the right side of his figure (pL 2(50 



Anat. Comp.), but attaches to it neither letter nor sign. 



Cleido-mastoid.-Is a comparatively broad and flat muscle, arising from the niastoidaJ 

 portion of the temporal bone, posterior to, and overlapped by, the origin of the sterno- 

 mastoid. It passes down, slightly and gradually diverging from this muscle, to 1, 



inserted into the sternal third of the clavicle, a slight interval being left between the 



inner limit of its insertion and the sterno-clavicular articulation. 



Stemo.mastoid.-An.es from the mastoid process of the temporal bone, in close con- 

 tiguity to, but covering, the preceding muscles at origin. Though running in companv 

 wn,h L above at first, it gradually parts company, and M finally mserted along e 



ed,e of the manubrium. Certain fibres, however, which are derived from ho 



of the muscle, are continued over the pectoral*, major , to meet - 



upper 



anterior free ed 



outerior iree euge ui *«* «.— ~, — opposite side, and to be finally 



similar prolongation from the sterno-mastoid ot tne opposu 



-'j, ««J ^tmltcrmuskeln. Hermann Pfeiffer. GiMBfl, 1854 : p. la 



Znr venrleichenden Anatomic to ^ dt ^^^rf the Shoulder-girdle and Hernum in the Vert.br* 



Mono 



BaySoc. 1868: p. 203. 



j 



Soc. 1868 : p. 203. . . ; . ^ cit 51l >. • Loc. at. p. U. 



Anat. Comp. pi. 259. fig. 2. 4 Op. cit. p. 431. 



