-u-rmim : the pleurapophyses of the nine ribs rapport bony appendage*. The orbiu are 

 remarkable for their siie, and |>artirularlv for the gret extension and anterior aspect of (heir 

 posterior wall, which i* chiefly due to the broad antero-|>osteriorly compressed postfrontal. 

 There ii a small t uperorripiul foramen, and a larger foramen on each side of it. The breadth 

 of the cerebral cavity exceed* iU length. The tarso-metatarsals are deeply excavated posit 

 riorly, and the outer distal tnx-hlra it much bent backwards. 



Mi 



1602. The skeleton of the Great Homed Owl (Bubo maxim**). 



Of the 19 rertebne between the skull and sacrum, the six posterior bear moveable ribs, the 

 last five pain of which unite with the sternum : there is a (seventh) pair of ribs attache*) i<> 

 the sacrum, but not to the sternum. The sternum, in this as in the preceding skeleton, luu 

 four posterior notches. A strong superorbital bone it attached to each autorbital process. 



MH*. Sou til. 

 Genus Athene. 



1603. The skeleton of an Australian Owl (Athene fortu). 



Of the 19 vertebras between the skull and sacrum, the six posterior bear moveable rib, the 

 last fire pairs of which unite with the sternum : there is one pair of sacral ribs, which does not 

 reach the sternum. The postfrontaU, mastoids and paroccipitaLi hare each the form of broad 

 thin platen, compressed from before backward*, thr postfrontals being unusually produced 

 downwards to increase the large orbit, and to give it a more anterior aspect. Thr frontal* 

 form a convex prominence above the base of the beak, and send off two nhort antorbital [in. 

 ceases. The angle of the jaw is unusually produced inwards : the pterygoid terminates be- 

 tween this and the orbital proems of the tympanic. The sternum pmenls four posterior 

 notches. There is no osseous bridge in front of the distal end of the tibia, but a strong our 

 |i.in- from the middle of the fore part of the proximal rod of the metatarsus to it* outer 

 border. The calcaneal process is produced backwards, and is expanded at its cxtn-tiuu . 

 The inner condyle of the metatarsus is bent backwards and inward*. The fibula has coalesced 

 with the tibia at two points. 



Genus Ofn*. 



1604. The sternum and scapular arches of a Horn Owl (Ohu). llunterian. 



Genus Syntinm. 



1605. The skuU of the Wood-Owl (Synium allied). 



Pre**ted by William Clift, E*q., F.R.S. 



1606. The skull of the Wood-Owl (Synium allied). H**tcria*. 



