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On the Claws and Spurs of Birds’ Wings. 
XXXIV.— On the Claws and Spurs of Birds’ Wings. 
By P. L. Sclater, M.A., Ph.D., F.R.S. 
[Continued from p. 151.] 
3. The Spur of the Spur-winged Goose ( Plectropterus 
gambensis). 
In Plectropterus gambensis we find a very different arrange¬ 
ment prevailing from what is met with in Chauna (above, 
p. 150). The single spur ( Sp ) is placed, not on the meta- 
carp als at all, but on one of the carpal bones; it projects 
about an inch in length, with a slight curvature towards the 
radius. 
There is an ungual phalanx, as in Chauna, at the extre¬ 
mity of the first digit, hut I am not sure that there is any 
Pig. 3. 
End of right wing of Plectropterus gambensis, reduced one half. Sp, spur. 
JD. 1 , first digit: Ph. 2, ungual phalanx of ditto. D. 2, second 
digit; D. 3, third digit, m.c, metacarpals. U, ulna. R, radius. 
corneous covering in this case to represent the unguis. The 
whole of the first digit measures 1*3 in. in this bird, being 
rather more than in Chauna derbiana , although the radius 
and ulna are slightly shorter. 
4. The Spur of Parra. 
In Parra we return, as regards the single spur, to nearly 
the same arrangement as is found in Chauna. The spur is 
placed at the basal extremity of the coalesced metacarpals, 
