242 



AVES. 



forwards, Cypselus (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 toes being free to their 



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

 a, pes adhamans of Cypselus apus ; b, P. scansorius of Picus capensis ; c, P. ambulatorius of 

 Pkasianus colchicus ; d, P. fissus of Turdus torquatus; e, P. gressorius of Alcedo ispida; f, 

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

 Struthio camelug ; i, P. palmatus of Sfergus merganser ; k, P. semi-palmatus of Recurvirosira 

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

 Steganus of Phaeton aetliereun. 



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 



