GEUES 871 



Mtjeib, has been rather more fully dealt with by Forbes, 

 The dorsal tract is double on the neck, and continues so 

 until its termination about on a level with the scapulae. 

 The posterior portion of the dorsal tract is not continuous 

 with the anterior portions ; it terminates with a slight bifur- 

 cation anteriorly and is widely dilated mesially. The ventral 

 tract is broken into two by the intervention of powder-downs, 

 and the pectoral branch is perfectly separated from the 

 main tract, a unique- feature, save for Mesites. It is the 

 scattered powder-downs which are apparently responsible 

 for much of the breaking up of the pterylse of Bhinochetus} 

 The semitendinosus, its accessory, the femoro-caudal, and 

 the ambiens are all present in the kagu. 

 As in Psophia and some other birds, the 

 semitendinosus is inserted in common with 

 the semimembranosus. The relations of the 

 last muscles and of the gastrocnemius are 

 illustrated in the accompanying figure (fig. 

 178), which will explain itself. Both pero- 

 neals are present, and have the typical 

 arrangement seen when both muscles are 

 developed. The deep plantar tendons are as 

 shown ia the figure (fig. 179). The flexor Fia. 1 79.— Deep 



7 77 . T J.1 1 11 1 J • Flexok Tendons 



haUucts supplies the hallux alone, and is g^ Bhinochetus 

 tied to the flexor communis by a strong (afteeBeddakd). 

 vinculum before the trifurcation of the 

 latter. The mode of insertion of the tensor patagii hrevis 

 *is complicated; the tendon divides into three branches, 

 the two inner of which are prolonged some way beyond the 

 tendon of the extensor metacarpi radialis longi, to which 

 they are first of all attached. There is a biceps slip} 

 The anconcBus longus has a flat tendon of origin from the 

 humerus, as well, of course, as its scapular head. A muscle 

 apparently peculiar to Bhinochetiis (see fig. 180) is what 

 has been termed by me an ' accessory biceps.' This arises 



' In his paper on Mesites, P. Z. S. 1882, p. 267. 



' I wrongly asserted the absence of this in my paper upon the anatomy of 

 the bird. 



li B 2 



