ON THE ANATOMY OF THE TODIES. 



347 



tensor patagii brevis at its termination has an arrangement almost identical 

 with that of the Momotidse*, only differing from it in the absence of the 

 thin slip of fascia which is continued, in them, from the recurrent 

 " passeriniform " tendon to the fascia covering the ulnar side of the fore- 

 arm. The deltoid has no special tendinous slip of origin from the scapula. 



Fig. 1. 



A B 



Syrinx of Todus : A, from before ; B, from behind. 



The triceps is Y-shaped at its scapular origin, and receives no tendinous 

 slip from the humerus. 



The construction of the syrinx may be best understood from an 

 inspection of the accompanying figures (fig. 1), representing the anterior 

 (A) and posterior (B) views of that of Todus dominicensis. The trachea 

 terminates below in an ossified bony box, formed of three or four modified 

 rings (probably bronchial) fused together, as is very evident in the 

 posterior view : as may also be seen there, the two preceding tracheal 

 rings are coossified with this box in the middle line posteriorly, though 

 in front they are quite free from it. The box is deeply notched in front, 

 a narrow pessular bar running backwards from the apex of the notch, 

 forming a three-way piece. The bronchial semirings succeeding the box 

 have the normal character. The lateral muscle of the trachea continues 

 downwards to terminate just on the upper limits of this syringeal box. 

 The syrinx of Todus viridis is constructed on exactly the same plan. 



Comparing these figures with those of Momotus lessoni given by Grarrod t, 

 it will be seen that Todus differs from Momotus in its syringeal box being 

 deeply notched anteriorly, and much more perfect posteriorly, the two 

 parts being united by a pessular bar unrepresented in Momotus. In fact 

 it resembles that of the Alcedinidae or Galbulidae rather than that of the 





* Cf. Garrod, loc. cit. p. 359. 



t L. c. p. 428. 



