242 



AYES. 



forwards, Cypselua (a) ; pedes scansorii, with two toes directed for- 

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

 directed forwards and one back, the anterior toe 3 being free to their 



FIG. 653. The most important forms of Birds' feet (b, c, d,f, n, from the regne animal) 

 a, pes adhamans of Cypselua opus; b, P. scansorius of Picus capensit ; c, P. ambulatorius of 

 Phasianus colchicus; d, P. fissus of Turdus torquatus; e, P. gressorius of Alcedo itpida; f, 

 P. insidens of Falco biarmicus ; g, P. colligatus of Mycteria senegalerait ; h, P. cursorius of 

 Struthio camelus ; i, P. palmatus of Mergus merganser ; k, P. semi-palmatus of Etcurcirostra 

 avocetta; I, P. flssi-palmatus of Podiceps cristatus ; m, P. lobatus of Fulica atra; , P. 

 steganus of Phaeton cethereus. 



roots, Turdus (d) ; pedes ambulatorii, with three toes directed for- 

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

 their roots, Phasianus (c) ; pedes gressorii, the inner toe is placed 

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



