PLATE XVII. 



FIG. SIZE. 



1. Apteryx australis 1 (adult). Shoulder-girdle and Sternum ; lower view . nat. size. 



2. Do. (half-grown). Scapula and coracoid ; outer view . nat. size. 



3. Casuarius Bennetti? (ripe chick). Shoulder-girdle and Sternum ; lower 



view . . -If diam. 



4. Dromaeus irroratm s (7 weeks incubation). Do. do. . do. 



5. Struthio camelus* (embryo, size of Sparrow). Do. do. . 2 do. 



6. Do. (half-developed embryo). Left Shoulder-girdle moiety; 



outer view . . do. 



7. Rhea americana? (ripe chick). Shoulder-girdle and Sternum ; lower view . 1J do. 



8. Do. (do.) Section of pleurosteon . 6 do. 



9. Dromam irroratus* (7 weeks incubation). Section of pleurosteon . do. 



10. Una troile 1 (one-third of incubating period). Shoulder-girdle and Sternum ; 



lower view . 5 do. 



11. Do. (do.) Sternum ; side view . . do. 



12. Do. (do.) Part of left Shoulder-girdle moiety ; outer 



view . . .11 do. 



13. Do. (do.) Right half of furcula; hinder view . 15 do. 



14. Do. (almost ripe embryo). Thorax; side view . 3 do. 



15. Slrigops habroptilus* (adult). Sternum; lower view . . . | nat. size. 



1 See p. 191. 2 See pp. 188, 189. 3 See p. 189. * See pp. 187, 188. 



See pp. 190, 191. 6 See p. 189. 7 See pp. 146148. 8 See p. 170. 



