Page 102. 
428 ON THE MUOMOTIDZA. 
In further favour of the inclusion of the Momotide with the Pici- 
formes may be mentioned the pterylographic peculiarity found in 
them all, namely that the outer pectoral branch of the inferior tract is 
separated almost entirely from the inner branch, with which it blends 
for nearly its whole distance, or entirely, in the Passeriformes. 
From a skin, I have been able to determine that the deep flexor 
tendons of the leg of Todus viridis are arranged on exactly the same 
plan in it as in the Momotide,* and that its tensor patagii brevis 
also terminates in exactly the same manner as it does in them.t 
The syrinx of the Momotide has never been fully described, so far 
as I am aware. I therefore exhibit a figure of it as it appears in 
Syrinx of Momotus lessoni. 
Momotus lessoni, which resembles that of the other species which I 
have examined. Fig. A is the anterior view; B, the posterior. 
The large cartilaginous three-way piece, in which the trachea 
terminates inferiorly, is compound, being formed of several fixed rings. 
It is complete in front, being represented behind by a hooked process 
on either side, extending inwards towards the middle line, where the 
two nearly meet. The lateral muscles of the trachea extend down to 
the upper margin of this peculiar syrinx; and a few of their anterior 
fibres continue onwards to the surface of the cartilaginous box, where 
they terminate, sometimes higher and sometimes lower, but always 
before reaching its inferior margin. 
* Vide “ Proceedings of the Zoological Society,” 1875, p. 344. (Supra, p. 294.) 
t Vide “ Proceedings of the Zoological Society,” 1876, p. 511. (Supra, p. 359.) 
