26 ELEMENTARY SKETCH OF THE OSTEOLOGY OF BIRDS. 



II. Saurur^.* 



5. Archceopierygidce (Archseopteryx.) 



B. Metacarpals aucbylosed together ; tail much shorter than 

 body. 



A, Sternum keelless. 



III. Ratit^. 



a. Humerus rudimentary or very short, not more than one 



ungual phalanx. 

 a. A hallux. 



6. Apterygid<B (Kiwis.) 

 h. No halluxv 



7. Dinornidee (Moas.) 



8. CasuaHdcB (Cassowaries.) 



b. Humerus long ; two ungual phalanges. 



a. Ischia uniting beneath sacrum ; pubes free. 



9. Rheidce (American Ostriches.) 



h. Ischia free, pubes uniting in a ventral symphysis. 



10. StrutJiionidcB (Ostriches.) 



B. Sternum provided with a keel.f 



IV. Carinat^. 



a. Vomer broad behind, interposing between pterygoids, 



palatines, and sphenoidal rostrum. 

 {Dromceognathce.) 



11. Tinamomorpha (Tinamous) 



b. Vomer narrow behind ; pterygoids and palatines articu- 



lating largely with sphenoidal rostrum, 

 a. Maxillo-palatines free.| 

 i. Vomer pointed in front. 

 (Schizognathts.) 



12. GharadriomorplKB (Plovers, and Tringas.) 



13. Cecomorplm (Gulls, Petrels, Divers and Auks.) 



14. Spheniscomorph(B (Penguins.) 



15. Geranomorpha (Cranes, Bustards, Rails, and Dicho- 



lopus.) 



16. Turnicomorphos (Hemipods.) 



17. AlectoromorpJice (Fowls.) 



18. Pteroclomorphds (Sand-grouse.) 



19. PeristeromorpJm (Pigeons and Dodo.) 



20. HeteromorpJics (Hoazins.) 

 ii. Vomer truncated in front. 



21. Coracomorphce (Passerines.) 



* The term Saururee is now somewhat inappropriate for thie order as, Sesperoriist 

 had also a long tail. 

 f Rudimentary in Strigops. 

 I Except Bicholo'pm and some species of Crax, 



