12 MR. F. E. BEDDARD ON THE [Jan. 6, 



is attached to the tendon of the extensor metacarpi radialis longus 

 are prolonged some way beyond that tendon. 



There is no tendinous slip uniting the distal end of the tendon of 

 the tensor patagii brevis with the tendon of the tensor patagii longus. 



Neither was there any trace, that I could discover, of a Biceps 

 slip running from the Biceps muscle to the tendon of the tensor 

 patagii longus. 



The arrangement of these muscles and tendons is not character- 

 istically like that of any of the allied groups ; most of the Gerano- 

 morphse of Prof. Huxley have the Biceps slip, which is, however, 

 absent in Cariamidae and in the Bustards. I may take this opportunity 

 of mentioning that in the Golden Plover (Forbes MS.) the Biceps 

 slip is tendinous, not muscular. Eurypyga helias, generally regarded 

 as a near ally of Rhinochetus, has a large Biceps slip [15] ; I can 

 confirm this by my own dissections. 



On the other hand, the Herodiones have no Biceps slip, but the 

 arrangement of the tendons of the tensores patagii differs from that 

 of Rhinochetus in the presence of a recurrent slip running from the 

 insertion of the tensor patagii brevis to the middle of the tensor 

 patagii longus tendon. The only birds known to me with which 

 Rhinochetus can be usefully compared, which have not this recurrent 

 tendon, are the Rails, Eurypyga, and Cariama. 



(2) The Rhomboideus supcrjicialis is a large fleshy muscle with a 

 tendinous origin for the greater part ; it is inserted into the entire 

 length of the scapula, with the exception only of a very small por- 

 tion at the free extremity, also into the clavicle : this muscle is much 

 thicker anteriorly than posteriorly, but thinnest of all in the middle ; 

 posteriorly its origin is fleshy, but at the end of the second third of 

 the muscle it begins to have a tendinous origin which increases in 

 breadth anteriorly. 



(3) The Rhomboideus profundus is as usual of much less extent 

 than the rhomboideus svperficialis; its origin is tendinous throughout; 

 it is attached along the scapula for about half the length of the 

 bone ,: the fibres of the muscle run at an acute angle with those of 

 the rhomboideus superficialis ; at the extremity of the scapula this 

 muscle is not covered by the superficialis. 



(4) The Latissimus dorsi, as usual, is double ; the anterior section 

 of the muscle (see fig. 2, L.d.l, p. 13) arises from the spine of the last 

 free dorsal vertebra and from the spines of a portion of the suc- 

 ceeding fused mass of vertebrae. It is inserted by a broad fleshy 

 insertion on to the humerus between the biceps and deltoid. 



The posterior part of the latissimus dorsi (L.d.2) is not continuous 

 at its origin with the anterior ; it arises from the spines of the fused 

 set of dorsal vertebrae, from the spine of the following vertebra, 

 and also from the edge of the ihum. Its fibres rapidly converge to 

 a tendon which crosses the anterior muscle, running below it, and is 

 inserted on to the humerus above the insertion of the anterior 

 latissimus dorsi in common with the accessory tendon of the anconaeus 

 longus. 



(5) The Deltoid (fig. 2, D, D", p. 13) is largely developed and 



