N. GYLDENSTOLPE, HEEL-PADS IN CERTAIN BIRDS. 3 



must be homologous to tbose found on the heel pads in 

 certain birds. 



In the foUowing pages T have given a sbort description 

 of the different appearance and shape of the heel-pads in 

 certain species of birds, then commencing with those, in 

 which the pads are most highly developed and furnished with 

 more or less sharp tubercles. 



Fam. Rhamphastidse. 

 Pteroglossus torquatus Wagl. 



Fig. 1. Fig. 2. 



Pteroglossus torquatus Wagl. Lateral Pteroglossus torquatus Wagl. Left 

 view of left tarsus. Vi. tarsus. \li. 



In the specimen examined, which is quite fullgrown and 

 in full plumage, the posterior part of the tarsal joint is cov- 

 ered by a thick, swollen knob which in its turn is covered 

 by two large dermal scales, forming a sharp edge at their 

 anterior extremity. The two scales are only loosely united 



