1872.] MR. A. SANDERS ON LIOLEPIS BELLI. 1 65 



was more apparent, though not more real, in the Gecko, because 

 there the teres minor was inserted nearer the external surface of the 

 bone, and consequently all the three insertions, being closer together, 

 were visible at once. At the time of writing that paper I was away 

 from England ; but since my return I have seen Prof. Rolleston's 

 paper* "On the Homologies of certain Muscles connected with the 

 Shoulder-joint," in which he goes far to prove that the "epicoraco- 

 humeralis" (which was Mr. Mivart's name for the supraspinatus) 

 corresponds to the subclavius ; but these differences of interpreta- 

 tion are reconciled by Mr. Galton's paper " On the Myology of the 

 Orycteropus capensis," in the same volume, in which the author 

 shows that the subclavius in that animal has, among other insertions, 

 one into the fascia covering the supraspinatus. Another piece of 

 evidence bears on this point : I believe that the nerve which in an- 

 thropotomy supplies the supraspinatus, arises from the same cord of 

 the brachial plexus and close to the one which supplies the subcla- 

 vius, so that the muscle in question really corresponds to the sub- 

 clavius at its origin and to the supraspinatus at its insertion. 



Biceps (figs. 1, 2, & 6) is represented only by its coracoid head. 

 This arises fleshy from about the posterior half of the lower border 

 of the coracoid fenestra, and forms a broad thin membranous tendon, 

 which passes over the humeral joint and developes a fleshy belly in 

 the arm, which is inserted into the contiguous surfaces of the ulna 

 and radius by a tendon which forms the distal edge of the insertion 

 of the next muscle. 



Brachialis anticus (figs. 1 & 2) arises from the outer surface of 

 the shaft of the humerus ; commencing at the root of the tuberosity 

 and extending to the distal extremity of the bone, it passes into the 

 forearm in compauy with the last muscle, and is inserted by mus- 

 cular fibres into the coronoid process of the ulna and into the sur- 

 face ot the bone beyond, being also attached to the flexor edge of 

 the articular surface of the radius. 



Coraco-brachialis longus (fig. 6) arises fleshy from the posterior 

 point of the coracoid bone, and is inserted into the lower end of the 

 humerus, for rather more than one third of its length, on the inner 

 and lower surface immediately above the condyle. 



Coraco-brachialis brevis (figs. 1 & 6) arises from the outer sur- 

 face of the posterior angle of the coracoid, being covered by the 

 central tendon of the biceps ; it is inserted into the lower surface of 

 the humerus for about two thirds of its extent, commencing imme- 

 diately beyond the head ; it has also an attachment to the capsular 

 ligament of the shoulder-joint. 



Triceps (figs. 1, 2, 3, & 6) in this specimen has three heads, since 

 the outer one does not divide into two as happens in Gecko. The 

 outer head arises from the outer or dorsal surface of the shaft of the 

 humerus for its whole length, commencing immediately below the 

 head of the bone. The middle or long head arises by a flat tendon 

 from the posterior edge of the scapula, close to the glenoid cavity ; 

 it is attached to the dorsal edge of the head of the humerus by a 

 * Trans. Linn. Soc. vol. xxvi. pt. 3. 



