256 



University of California Publications in Zoology LVoi.l3 



Group 



DISTEIBUTION OF PLUMULES 



oi? o ft 



Struthioniformes .... 



Rheiformes 



Casuariiformes 



Crypturif ormes 



Apterygiformes 



Spheniseiformes 



Colymbiformes 



Procellariiformes .... 

 Ciconiiformes 



Steganopodes 



Ardeae 



Ciconiae 



Phoenicopteri 



Anseriformes 



Falconiformes 



Galliformes 



Opistliocomi 



Mesaenatides +(? 



Gruiformes 



Charadriif ormes 



Laro-limicolae 



Alcidae + 



Others 



Pteroclo-Columbae .... 



Cuculiformes 



Psittaci -f 



Cuculi 



Coraciiformes 



Coraciae 



Alcedinidae + 



All others 



Strlges 



Caprimulgi 



Micropodii 



Trochilidae 



Colli and Trogones .... 

 Pas serif ormes and 



Pici 



rt ® 

 ]=>% 



^l 



< <B 

 + 

 4- 



+ 



+ 



< 



+, very large 



-, or rudimentary 



+ 











+ 



+ 













+ 



+ 









+, rudimentary in Diomedea 



+ 



.... 



+ .... 



.... 



+, or rudimentary 



+ 



+ 











.... 



variable 



+ 









.... 



+, well-developed 



+ 











-, rudimentary in a few genera 



+ 

 + 



.... 



+ .... 





+, - in Pandion and Cathartidae 

 +, large or small 



+ 



+ or4- 







+ 



".'. z 



+ 



+ 



.... 



+ 



.... 



+ 



.... 







+ 







+ 



variable, usually present 



+ 

 + 

 small or rudimentary 



+, large 



-, or rudimentary 



+, often rudimentary 

 -, rudimentary in Ahico 

 small or - 



+ 



+ 



+, not highly developed 



evolution, if this hypothesis be true, resulted iu the segregation of 

 contour feathers into tracts, and the reduction of plumules, first 

 between the contour feathers, and finally on the whole body, culnii- 



