302 ON THE ANATOMY OF RHYNCHOPS. [Teb. 18, 
halves, that which abuts upon the patagium, is chiefly tendon, 
there being a belly of only about half an inch in length, strung as 
it were upon a long thin tendon. The inner half of the muscle, on 
the contrary, is muscular almost to its insertion. 
I did not succeed in finding any traces of the eapansor secun- 
dariorum, for which as a characteristic muscle I looked carefully. 
The deltoid is not extensive. Its humeral attachment occupies 
rather more than the first third of that bone. It ends exactly on 
a level with the end of the attachment of the anterior section of 
the latissimus dorsi. 
The anconeus longus, in addition to the partly fleshy and partly 
tendinous origin from the coracoid, has a longish and entirely 
tendinous scapular head ; it also is bound down to the humerus by 
a broad tendon. 
In the leg-muscles the most remarkable divergence from the 
Larine character is in the total absence of the ambiens (on both 
sides of the body). 
The femoro-caudal is present and has a long tendon of insertion. 
The accessory femoro-caudal is broader than the latter, is entirely 
fleshy, and joins it some way before its insertion. 
The semitendinosus with its accessory are present. 
There is nothing remarkable about the biceps or semimem- 
branosus, 
There is only one peroneus, whose tendon joins that of one of 
the superficial long flexors. 
The deep flexors blend entirely about halfway along the meta- 
tarsus ; the conjoined tendons give off no slip to the small hallux. 
§ Syring. 
The syrinx of Rhynchops (fig. 3) is a perfectly typical tracheo- 
bronchial syrinx with a single pair of intrinsic muscles. 
Syrinx of Rhynchops; lateral view. 
