1867.] 



MYOLOGY OF IGUANA TUBERCULATA. 



769 



Longissimus dorsi. This is small and very indistinctly separable 

 from the sacro-lumbalis. It partly arises from the posterior end of 

 the crest of the ilium ; partly it is the anterior continuation of the 

 dorsal series of caudal muscular cones, or rather to the halves of 

 those cones. Passing forvvai'ds it is inserted into, and takes fresh 

 origin from, the spines and adjacent parts of the vertebrae. 



The saci'o-lumbalis, though wide, is very thin, except at its poste- 

 rior end, and it is very imperfectly separable from the last. It arises 

 from the crest of the ilium, and appears to be partly continuous with 

 the supracaudal muscular mass. It is inserted, in an indistiuct 

 manner (by tendinous intervals which become more marked from 

 behind forwards), into the ribs, including the cervical ones, as it 

 passes insensibly into the cervicalis ascendeus. 



Comjileocus major (figs. 2 & 2a, C. Ma.). This is an elongated 

 muscle arising by tendinous fibres from the spines of the first and 



Fig. 2. 



■Z?/l?>f JJj 



Fig. 2. 

 Muscles of neck and shoulder, the trapezius and deltoid being cut short. 



B. Biceps. B. A. Brachialis anticus. C. M. Cerato-mandibular. C. Ma. Com-, 



plexus major. C. Mi. Complexus minor. D. 1. First part of deltoid. 

 B. 2. Second part of deltoid. Z>. M. Depressor mandibular. E. H. Epi- 

 coraco-humeral. 1. S. Infraspinatus. L. C. Levator claviculre. 0. H. 

 Omo-liyoid. P. Pectoralis. 8. C. M. Sterno-cleido-mastoid. 8. Mg. Ser- 

 ratus inagnus. T. 1. External long head of triceps. T. 3. External hume- 

 ral heatl of triceps. Tz. Trapezius, x. Fasciculus from complexus minor. 

 The muscle between B. 2, 8. Mg., and T. 1. is the subscapularis. 



Fig. 2 X. 



Deeper muscles of right side of neck, the levator clavicula; being cut short, the 

 sterno-cleido-mastoid cut and reflected forwards, and the complexus major 

 cut and raised. 



C. A. Cervicalis ascendens. C. Ma. Complexus major. C. Mi. Complexus mi- 



nor. B. M. Depressor mandibula?. B. A, M. Rectus capitis anticus major. 

 R. P. M. Eectus capitis posticus major. Sc. Scalenus. 8. C. M. Sterno- 

 cleido-mastoid. x. Fasciculus from complexus minor. 



