on classification of Passeres, [467]

Furcula, [7], [8];

absent in Apterygidae, [39];

absent in Dinornithidae, [42];

absent in Rheidae, [30];

absent in Struthionidae, [27];

ancylosed with sternum in Gruidae, [252];

in Otididae, [261];

in Heliornithidae, [267];

coalesces with coracoids in Fregata, [72];