748 



PTILOP^DESPUCKERIGE 



The figures here inserted serve to shew some of the differences 

 of Pterylosis presented by various birds; but it will be obvious 



CINNYRIS CHLOROPYGIA. Ventral and dorsal aspect. 



ARACHNECHTHRA 

 and CINNYRIS 

 OBSCURA. Dor- 

 sal tract. 



that a very long series would be required to exhibit even the 

 principal types observable in the whole Class. 1 



PTILOP^EDES, a name proposed in 1872 by Sundevall 

 (Tentamen, p. 102) for his second division (agmen) of the Class Aves, 

 being the Birds whose young are thickly covered with down before 

 their feathers grow: in 1873 changed (torn. cit. p. 158) to 

 Dasyp&det, to prevent confusion with PSILOP^EDES. 



PTILOSIS, the learned word for Plumage. 



PUS IS (properly Os pulis) or PUBIC Bones, the anterior, 

 most ventral and slenderest of the three component parts of the 

 PELVIS. 



PUCKEKIGE (possibly connected with the A.S. puca, a goblin 



1 Since the time of Nitzsch additional descriptions of the Pterylosis of certain 

 birds have appeared, but no special work on the subject, though it has by no 

 means been exhausted, and such a work would be of considerable taxonomic 

 utility if it were amply illustrated (little text being needed) and special attention 

 paid to the numerous transitional forms that connect the chief types. A great 

 and revised mass of information is to be found, however, in Prof. Fiirbringer's 

 Untersuchungen der Morphologic und Systematik der Vogcl, 



