THOEACIC LIMBS 



591 



VARIATIONS IN FORM AND DEVELOPMENT. 



I have seen very few variations in the radius. In some skeletons 

 the bone is almost straight, in others it is so strongly bowed that the 

 anterior surface and the internal border are concave from above down- 

 ward. 



The notch on the posterior border of the head is often limited 

 externally by a distinct tubercle. 



The nutrient foramen is very constantly on the anterior surface 

 near the internal border, and in the lower part of the upper third of 

 the bone ; rarely it is further removed from the border, or even near 

 the oblique line. 



The anterior surface in some specimens is marked by an oblique 



