PsiTTACID^E.] 



OSTEOLOGIA AVIUM. 



[Cacatuin^e. 



Pal^eoknis, Vig. 



Columboides, Vig. 



Very similar to Psittaeus, but with the keel of the sternum deeper in proportion to 

 its width, which is the same posteriorly as anteriorly, and the pelvis narrower in pro- 

 portion to its width ; the bony ring round the orbits not quite complete. Palceomis 

 ponticerianus is similar. 



Measurements. 



Tenths. 



Length of humerus 12^ 



Length of ulna 15 



Length of metacarpus 9 



Length of femur 13 



Length of tibia 19 



Length of metatarsus 6 



Length of sternum 16 



Tenths. 

 Breadth of posterior margin of sternum 7 

 Breadth of anterior margin of sternum 7 



Depth of keel 6^ 



Length of head 19 



Breadth of head 10 



Length of pelvis 19^- 



Breadth of pelvis 7 



Subfam. 2. Cacatuin^e. 



Cacatua, Priss. 



Galerita, Lath. 



Type of Cacatuinas. 



Cranium stronger than in Psittaeus ; the vertex very flat nearly to the base of the 

 nasal bones, where there is a deep transverse impression ; orbits round ; the anteorbital 

 process united to the cranial portion of the sphenoid; posterior ends of the inferior 

 maxillaries sloped downwards and backwards to a point. 



Sternum entire, without any foramen or fissure on its posterior margin, similar in shape 

 to Psittaeus, but with the keel more arched and the manubrial process broader. Coracoids 

 strong, projecting far forwards beyond the glenoid cavity. Furculum similar to Psittaeus, 

 but much stronger. Scapula short, much more bent downwards at the extremity than in 

 Psittaeus. Pelvis similar to Psittaeus, but with the obturator foramen not above half the 

 width. The remaining portion of the skeleton also similar, but much stronger. 



Measurements. 



Tenths. 



Length of humerus 35 



Length of ulna 43 



Length of metacarpus 23 



Length of femur 25 



Length of tibia 23 



Length of metatarsus 12 



Length of sternum 31 



70 



Tenths. 

 Breadth of posterior margin of sternum 15 

 Breadth of anterior margin of sternum 1 4 



Depth of keel 10 



Length of head 30 



Breadth of head 17 



Length of pelvis 35 



Breadth of pelvis 14 



