ON THINOCORUS AND ATTAGIS. AI7 
from the biceps to a little above the middle of the tendon of the tensor 
patagii longus—the tendon of the tensor patagii brevis being in two 
parts, of which the outer is the broader and stronger. Where this 
latter joins the extensor carpi radialis longus a fan-shaped fibrous ex- 
pansion is sent off to the middle long patagial tendon, as in the Limi- 
cole generally. 
The obturator internus muscle is very small and oval in shape. 
Both the right and left carotid arteries are developed in the two 
genera, which agree exactly in their myology. 
Skull of Attagis gayi. 
The lower larynx is simple, a slender muscle on each side running 
to the fourth bronchial half-ring, which, like the three above it, is 
deeper than the other bronchial half-rings, and more like a split 
tracheal ring. 
Osteologically the Thinocorine present many features of interest. 
In his more recent communication “ On Aigithognathous Birds” 
(part II., read before this Society in February 1876, and not yet pub- Page 416. 
lished), Professor Parker has fully described and beautifully figured 
the skull of Thinucorus rumicivorus, and has drawn special attention to 
the spuriously Aigithognathous nature of the palate, with its pecu- 
liarly broad vomer, rounded in front, and there intimately connected 
with the nasal cartilages in a manner which much resembles the 
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