Struthonid^:.] 



OSTEOLOGIA AVIUM. 



[Steuthionin^. 



Order X. CUESOEES. 



The birds constituting this order have been so amply treated of in the first four 

 volumes of the transactions of the Zoological Society that there is nothing more to be 

 recorded. 



Measurements. 



Inch. 



Length 

 Length 

 Length 

 Length 

 Length 

 Length 

 Length 



Struthio 



s* 



Inch. 



Breadth of posterior margin of sternum 5 

 Breadth of anterior margin of sternum 9 



Depth of keel None 



Length of head 6f 



Breadth of head 2| 



Length of pelvis 23 J 



Breadth of pelvis . 8 



Illustrations. 

 camelus, Plate II. Details, Plate XXIII. | Casuarius Emu. Details, Plate XXIV. 



of humerus 13 



of ulna 



of metacarpus 23 



of femur 11 



of tibia 10 



of metatarsus 17J 



of sternum 8 J 



Apteryx, Shaw. 



Australis, Shaw. 

 Also fully treated of in the first four volumes of the Zoological transactions. 



Illustrations. 

 Details, Plate XXV. 



Numbering of the Vertebra and Ribs in Cursores. 





Cervical. 



Dorsal. 



Sacral. 



Caudal. 



True ribs. 



False ribs. 



Struthio camelus 

 Dromarias Emu 

 Casuarius Emu 

 Apteryx Australis . 



16 

 20 

 15 



18 



7 

 8 

 9 

 6 



18 

 15 



15 



6 

 6 

 6 



7 



5 

 6 

 6 

 6 



3 



5 • 



3 



3 



Remarks. 

 The cursorial birds maybe at once distinguished from the other orders by the absence 

 of any keel to the sternum, the shortness of the wings, and the peculiar form of the 

 pelvis. 



2d 



173 



