160 Walter Rothschild. 



Eggs. 



/Egg larger, i8o X 150 mm ^S'. cliersonensis. 



\ Egg smaller, 160 X 135 mm No. 2. 



/Egg smooth S. camelus. 



\ Egg not smooth No. 3. 



iEggwith deep pores, few and scattered 8. molybdophanes. 

 Egg with deep pores, numerous and 

 close together No. 4. 



/ Egg with fewer deep pores S. massaicus. 



^ \ Egg with many deep pores ...... S. australis. 



Rhea. 



Fossil. 

 The 3 fossil forms are too imper- 

 fectly known to me for purposes 

 of this key. 



Recent. 

 Metatarsus feathered in front on 

 upper part, most of feathers with 



white tips B. darwini. 



Metatarsus with no feathers on upper 



part, no white tips to feathers . . . No. 2. 



^f Darker, skull narrower B. americana. 



" I IJghter, skull broader B. nandù. 



Dromaius. 



Fossil. 



{Legs shorter and stouter than 

 D. iwvaehollandiae. ' D. patricius. 



Legs longer and more slender than 

 D. novaehollandiae. D. gracillipes. 



Recent. 



/ Size large No. 2. 



\ Size smaller No. 3. 



iChin and throat black D. novaeiioUandiae no- 

 vaehollandiae. 

 . . . . 



Chin and throat whitish D. novaehollandiae die- 

 menensis. 

 / Colour very dark, limbs slender . . . D. parvidus. 

 ^ \ Colour pale, limbs shorter and stouter B. minor Spencer. 



Casuarius. 



Distal extremity of tibio-tarsus broad 



with deep semilunar pit on lateral 



surface of ectocondyle, extensor 



groove shallow No. 2. 



Distal extremity narrow, no semilunar 



pit, extensor groove deep No. 17. 



