132 CAKINAT^. 



The ulna, which is frequently shorter than the humerus, is much 

 curved, with a flattened inner face, a laterally compressed proximal 

 extremitj', a small and narrow but well developed surface for the 

 brachialis anticus, and a much enlarged distal extremity. 



The metacarpus is cliaractcrized by the great outward curvature 

 of the smaller bar, which is attached to the larger one only by its 

 extremities ; except in Numida and the Cracldce there is a lamellar 

 intermetacarpal process arising from the proximal end of the larger 

 bar and reaching to the edge of the smaller one. 



Family TETRAONID^. 



Among other features, the members of this family are character- 

 ized by the absence of any spur on the tarso-metatarsus of the 

 males. This bone is very short, with the distal trochlea) widely 

 separated, the third trochlea being inclined somewhat outwardly, 

 and the second very short. 



Genus TETRAO, Linn.' 



The type genus. The tibio-tarsus has a slender shaft and small 

 distal condyles, of which the inner one is generally slightly oblique ; 

 the intercondylar gorge is narrow, and the extensor bridge short 

 and oblique. The tarso-metatarsus is short and stout. In the 

 humerus the head is moderately elevated above the inner tuberosity ; 

 the subtrochanteric foramen is not very large, and opens on the 

 general surface of the bone ; and the depression for the brachialis 

 anticus is large and very shallow, with its inner border approximated 

 to the iuner side of the shaft. The coracoid is long and narrow, 

 with a prominent and inflected head, and the hyosternal process 

 thick and solid. 



Cctrao tctvi)f, Linn.^ 



C!onsiderablv smaller than the next species, although larger than 

 either of the species of Lagoims. The middle of the distal extremity 

 of the coracoid is thickened, so that the sternal surface is chevron- 

 shaped. 



Hah, Europe. 



1 Syst. Nat. eel. 1l', vol. i. p. 273 (1766). 

 ^ Ibid. p. 274. 



