277 



In this skeleton the bony suborbiul proccs*. continued from the lacrymal, does not reach 

 the postfrontal. nor don this join the mastoid. There are 1 7 vertebras between thr tknll 

 uid sacrum, of which the six posterior tupport moveable rib* : of these the last four pair* 

 articulate with the sternum. The two anterior sacral rertebne also support ribs, thr first of 

 which joins the sternum. * 



Mn. Stint h 



1487. The skeleton, with the hyoid arch, larynx and trachea of the Blue and Yellow 

 Maccaw (Macrocerctu ararauna). 



The suborbital arch of bone is complete. Of the IN Tertebrse between the skull ami 

 sacrum, the last six bear moveable ribs : of these the last four pairs unite with the sternum. 

 The first two sacral vertebrae also bear ribs, both pairs of which articulate with the (ternunv 



1488. The skull and upper mandible of the great Red and Blue Maccaw (Macro- 

 cerctu Macao). 



1489. The dried head of the Blue and Yellow Maccaw (Macrocerciu araranna). 



Genus Plyctofapkia (Cacatua, Brisson). 

 1440. The skeleton of the Crested Cockatoo (Plycioloph** galerihu). 



Of the 18 vertebrae between the skull and sacrum, the six posterior bear moveablr ribs, 

 the last four pairs of which articulate with the sternum : there are also two pairs attached to 

 the sacrum, the first of which joins the sternum. The mastoid coalesces with the post- 

 frontal, and this by an extension of ossification below the orbit with the lacrymal. The ster- 

 num is entire. The coracoid sends off a curved lamellar process from its inner side near iu 

 upper end. 



Mnt 



1441. The skeleton of the Pink Cockatoo (Plyctolophu* Leadbeateri). 



Of the 1 7 vertebrae between the skull and sacrum, the six posterior bear moveablr ribs. 

 the last four pairs of which unite with the sternum. The sacral rib joins the sternum. 



Mm* Go*ld. 

 Subgenus Licmetu. 



1442. The skeleton of the Long-billed Cockatoo (Plyctolopku* (Licmtfi*) naticiu. 



Of the 1 8 vertebra: between the skull and sacrum, the six posterior bear moveable ribs : 

 the last four pain of these unite with the sternum : there are also two pain of ribs attached 



