GRUES 371 



MUEIE, 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 Bliinochctus. 1 

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

 the ambiens are all present in the kagu. 

 As in Psopliia and some other birds, the 

 semitendinosus is inserted in common with 

 the semimembranosus. The relations of the 

 last muscles and of the gastrocnemiiis are 

 illustrated in the accompanying figure (fig. 

 17iS), which w r ill 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 in the figure (fig. 179). The flexor FIG. no. DEEP 



7 77 v .1 i in -i FLEXOR TENDONS 



liuUucis supplies the hallux alone, and is OF 



tied to the flexor communis by a strong ( AFTER BEDDARD). 

 vinculum before the trifurcation of the 

 latter. The mode of insertion of the tensor patagii brevis 

 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 sJi}).~ 

 The anconceiis long us has a flat tendon of origin from the 

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

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

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



1 In his paper on Mcsitcs, P. Z. S. 1882, p. 267. 



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

 the bird. 



I! H 2 



