ON THE ANATOMY OF PASSERINE BIRDS. 359 
In the Coraciide, as represented by Coracias garrula and a species 
‘of Eurystomus which was not in sufficiently good condition to be more 
definitely determined, Plate [22] XLIX. fig. 1 represents the distribu- 
tion of the tendons, there being two parallel to one another, the 
anterior one of which runs to the superficial ulnar fascia before 
terminating, and sends wristwards a slip, like that in the Meropida, 
to the long eztensor. There is a passeriform free tendon running 
back to the lower end of the humerus from the outer tendon. 
In the Momotide the condition is the same, except that the outer 
tendon does not split, and therefore sends forward no wristward slip. 
_ This condition I have found in Momotus lessoni, in M. equatorialis, 
and in Humomota superciliaris. The extension on to the ulnar super- 
ficial fascia springs from the portion of the horizontal tendon inter- 
mediate between the points of junction of the two parallel long 
tendons, and is not a direct continuation of either. It is frequently 
very thin. 
In the Trogonidez, as exemplified by Trogon mezxicana, T. puella, 
and Pharomacrus mocinno, the condition is very complicated. It is seen 
_ in Plate [24] LI. fig. 3. A superficial long muscular mass runs nearly 
_ to the long eztensor of the forearm. It has a short broad tendinous 
insertion into the fascia of the outer surface of the forearm; and this 
is specially developed in a line running back to the humerus in a 
__ passeriform manner. Deep of this are two parallel tendons; the one 
nearer the humerus terminates exactly like the single one of the 
Passeres ; that further off ends as in the Pici above described. 
In the Caprimulgide, as found in Caprimulgus europeus and 
Chordeiles texensis, the arrangement is almost exactly the same as in 
the Meropide. The second outer tendon, however, is shorter. 
In the Macrochires, including the Trochilide and the Cypselide, as 
found in many genera and species the arrangement is uniform. The 
fleshy belly runs on to a special tendon which springs from the lower 
end of the outer surface of the humerus (where the horizontal slip in 
the Passeres terminates), and is continued,’ parallel to the forearm, 
along the radial margin to thehand. Plate [24} LI. fig.1 exhibits this 
condition. It can be here seen that the tendon of the tensor patagii 
brevis is not developed, being replaced by the fleshy continuation of 
the muscle. 
In Upupa epops the arrangement is fairly simple. The main 
tendon runs past the free lateral margin of the long extensor to the 
ulnar superficial fascia, where it becomes lost. It sends forwards a Page 512. 
fasciculus from about its middle, to end like the similar band in the 
Meropide. It is figured in Plate [23] L. fig. 2. Its difference from 
the Passerine arrangement is well-marked. 
In the Bucerotide, as found in several species of Buceros, Toceus, 
