308 



STRUCTURE AND CLASSIFICATION OF BIRDS 



the same arrangement and veins as in Pterocles ; bijt the 

 caeca no longer run along it, but occur as very short stumps 

 upon the rectum.' 



The cmca are small and nipple-like ; they may be entirely 

 absent. In Tympanistria bicolor I found one, an especially 

 minute one, on the left side. 



The intestines of the Columbse are very short and volu- 

 minous in some of the fruit-eating forms, moderately long in 

 the majority of forms, and extraordinarily long in Bidun- 

 culus. The following are a few measurements :— 



In Goura Victories the tensor brevis muscle is bordered 

 on the patagial side for the last half of its course by a strong 

 tendon, which arises from the pectoralis muscle. Below this 

 tendon forms the outer and stronger part of a thin and 

 rather wide tendon, in which the muscle itself ends. A 

 wristward slip is given off, but there is no patagial fan. The 

 biceps slip arises tendinously from the biceps, has a short 

 muscular belly, and ends tendinously upon tensor patagii 

 longus tendon. 



Goura coronata is much the same, but the biceps slip is 

 (? exceptionally) digastric, a second tendon springing from 

 tensor patagii longus muscle, and becoming muscular before 

 it joins the muscular belly derived from biceps itself. 



In other pigeons — and this is one of the most salient 



