242 



AYES. 



forwards, Cypselus (a] ; pides scansorii, with two toes directed for- 

 wards and two backwards, Picus (b) ; pedes fissi, with three toes 

 directed forwards and one back, the anterior toes being free to their 



I 



FIG. 053. The most important forms of Birds' feet (b, <, d,f,n, from the regne iinimal). 

 a, pes adhamans of Ct/jmelu* // ;l, P. scansoriusof Picas cupf axis; c, P. ambulatorius nf 

 Phusianus colcliirus ; d, P. flssus of Turdus ton/Katiis ; f, P. gressorius of Alcedo ixjiidu .- /, 

 P. insidens of Falco biarmifus ; <j, P. co'.liputus of JHyctcria aenegalensis ; h, P. cursorius of 

 Struthio eameliis ; i, P. palmatus of Mtrgus merganser ; k, P. semi-palmatus of Recurcirostra 

 apocrtta ; I, P. fissi-palmatUS Of 1'oiUcc/ix i-rinttitiiK ; in, P. lobatus of Fulica ittra ; n, P. 

 stcfjanus of Phaeton, attiercns. 



roots, Turdus (d) ; pe.des ambulatorii, \\itli three toes directed for- 

 ward, the inner toe backwards, the middle and outer toes united at 

 their roots, Pliaslanus (c) ; jjedes gressorii, the inner toe is placed 

 behind ; of the three anteriorly directed toes, the middle and outer 



