1877.] MR. A. H. GARROD ON THINOCORUS AND ATTAGIS. 415 



deep plantar tendons are arranged as in Aptenjx and many other 

 birds in which the hallux is small, the flexor longus hallucis blending 

 with the flexor digitorum profundus, at the same time that a slender 

 slip is sent off from the inner side of the conjoined tendon to the 

 hallux \ 



In the patagium of the wing a slender muscular fasciculus runs 

 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 expansion is sent off to the middle long patagial tendon, as in 

 the Limicolae 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 Atfagis 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 Thinocorinse present many features of interest. 

 In his more recent communication " On iEgithognathous Birds " 



Vide P. Z. S. 1875, p. 341. 



