98 CARINA!^. 



the subclavicular process is small, crotchet-like, situated high up, 

 and usually without any foramen at the base ; the hyosterual 

 extremity is deep and abruptly truncated, with only a small process ; 

 and the sternal surface is narrow. The furcula is U-shaped, 



The more or less elongated and slender humerus is moderately 

 curved, with a large proximal extremity, characterized by the 

 enormous subtrochanteric fossa and foramen, largo bicipital surface, 

 deep and narrow supratrochanteric groove, absence of distinct coraco- 

 huraeral groove, and by the facet for the pectoralis minor being 

 situated on the dorsal aspect of the delto-pectoi'al crest ; the distal 

 extremity is narrow, with prominent condyles, of which the radial 

 is less pointed than usual, a very small surface for the brachialis 

 anticus, and no ectepicondylar process. 



The ulna is comparatively short and stout, with a nearly cylin- 

 drical shaft, and the distal extremity much expanded. 



The metacarpus is long and characterized by the narrowness of 

 the interval between the two bars, which are parallel. 



Family ANATID.E. 

 Includes all the representatives of the suborder. 



Subfamily Plectropterin^. 



Allied to the two following subfamilies, but distinguished by the 

 wing being armed with a bony spur or knob, which may be attached 

 either to the radial carpal [Plectropterus), or to a prolongation of 

 the radial process of the metacarpus. 



Genus CHENALOPEX, Stephens \ 

 The proximal radial process of the metacarpus developed into a 

 flange-like expansion for the articulation of the bonesupjjorting the 

 knob on the wing. 



Chenalopex pugil, Winge ^ 



Distinguished from the existing C'.jubata of S. America by its 

 much larger size. 



Hab. South America (Brazil). 



' In Shaw's General Zoology, vol. xii. pt. 2, p. 41 (1824). 

 ' E. Mu3. Lund. vol. i. art. 2, p. 3 (1888). 



