484 Mr. J, Wood on Variations in Human Myology. [June 18, 



Fig. 1 (Subject No. 3). 



mens affecting 13 muscles proper to the hmd and neck, and 40 others 

 affecting 6 muscles which, acting upon the clavicle or scapula, are num- 

 bered with the muscles of the upper extremity, viz. the cleido-occipital, 

 sterno-cleido-mastoid, omohyoid, trapezius, levator anguli scapulae, and 

 levator claviculee. 



1. Cleido-occipital {Cephalo-humeral of the lower animals). — Of this 

 muscle 8 specimens have been found in the male subjects, all on both 

 sides — and 6 in the fetnales, two of which were on the left side only. On 

 the left side of No. 3, male, and on both sides of No. 7, male, the curious 

 and interesting arrangement was found which is drawn from the former 

 subject in fig. 1. A sUp of parallel muscular fibres, three-fourths of an 

 inch wide (a), arising from the sternal 

 end of the clavicle, close outside of 

 and in connexion with the sternal 

 origin of the sterno-mastoid, crossed 

 superficially and obliquely the cleido- 

 mastoid (b) (which was split into 

 two parts) to join the cleido-occipi- 

 tal (c) about its middle. The more 

 usual clavicular attachment of the 

 latter muscle was broad, and connected 

 with the centre of the clavicle directly 

 over the posterior triangle, reaching 

 from the origin of the cleido-mastoid 

 as far out as the clavicular attachment 

 of the trapezius (d). This arrange- 

 ment gives a very complex appearance 

 to the whole group of muscles, and 

 strikingly resembles the formation in 

 the Marmot, Polecat, Genette, and 

 striped Hyaena, and, to a less extent, 

 in the Coati. In these animals the ce- 

 phalo-humeral is only connected with 

 the trapezius close up to the occiput. Towards the clavicle it is con- 

 tinued forward, superficial to the cleido-mastoid, and joins wholly or by 

 a separate slip with the sterno-mastoid (see Cuvier and Laurillard's plates). 

 This resemblance to the cephalo-humeral of these animals tends strongly to 

 confirm the view of the homology of the cleido-occipital in Man, given by 

 the author in former papers. On the right side of the subject No. 3, 

 the cleido-occipital was large, but presented ivo slip of connexion with the 

 sterno-mastoid ; but it was found on both sides of No. 7. A tendency to 

 this formation was seen also in subject No. 21 of last year's Table. 



In No. 13 the cleido-occipital was double, and distinct from both the 

 cleido-mastoid and trapezius along its whole length. This homologue of 

 the cephalo-humeral of animals was found distinct and very well marked 



