Vol. XIV. 

 1914 



1 Leach, The Myology of the Bell-Magpie. i^ 



combined tendon of the coraco-hrachialis and the teres minor 

 (61 and 62). 



66. The serratiis parvus anticiis consists of three muscle bands 

 arising from the first free rib and the next two true ribs. These 

 arise above the origins of the serratiis magnus anticus (59) and the 

 thoraco-scapularis (64). The fibres form a Ifat sheet inserted on 

 the inferior margin of the scapula. 



The levator scapulcB (63), the thoraco-scapularis (64), and the 

 serratus parvus anticus (66) are parts of the one system of muscles 

 binding the scapula to the chest. 



///. — The Tensor Patagii Muscles (2). 



67. The tensor patagii longus. 



68. The tensor patagii hrevis. 



67. The tensor patagii longus [22] arises by a common tendon 

 with (68) from the inner side of the head of the clavicle. The 

 tendon soon becomes fleshy, and forms a thin, spindle-shaped 

 muscle, giving off a very elastic tendon, which runs in the front 

 edge of the patagium. It passes over the end of the radius to 

 the side of the tendon of the extensor metacarpi radialis longus. 

 It is attached to the os radiate of the wrist and the fascia about 

 the wrist-joint. The tendon, soon after leaving the muscle part, 

 is joined by the tendon from the dermo-tensor patagii (6). About 

 a quarter of an inch on the proximal side of the beginning of its 

 tendon the tensor patagii longus gives off a tendinous thread over 

 half an inch in length. This is inserted into the anterior lateral 

 face of the pectoralis major (49). 



68 The tensor patagii hrevis [22] [24] arises by a common tendon 

 with the tensor patagii longus (67) from the head of the clavicle. 

 It soon broadens out into a strong muscle that narrows again 

 and gives off a strong tendon which runs down parallel to the 

 humerus till it meets the extensor metacarpi radialis longus {y^). 

 Here the tendon bifurcates, and one short part runs directly 

 outwards along the top of that muscle (73), and soon merges with 

 that muscle. The other runs back with, but distinct from, the 

 tendon of the muscle {yT,). to be inserted just below the external 

 condyle of the humerus. The insertion of the tendon of the 

 muscle itself is on the outer aspect of the tubercle, as Shufeldt 

 found in the American Raven. The Strepera, Australian Raven, 

 Gymnorhina, and Cracticus agree in this. They also agree in a point 

 not mentioned for the American Raven, and that is that the muscle 

 gives off a tendinous loop, which arises a little higher than the 

 tendon and runs in the patagium, to be inserted in the pectoralis 

 major (49), as shown in diagram [22]. This loop resembles one 

 figured in a Picarian bird, Buceros rhinoceros, by Garrod in the 

 " Proceedings of the Zoological Society of London," 1876, 

 pp. 506-J19, plate xix., fig. 2. Garrod, as already remarked, found 

 this muscle of taxonomic value. 



