1856.] OWEN — GASTORNIS PARISIENSIS. 207 



trochlear surface is narrow and slightly concave. The fibula is not 

 anchylosed to the tibia in the Vulture. 



Order Insessores. 



In the Raven (Corvus cor ax, fig. 4) the breadth and depth of the 

 condyles are nearly equal : the condyles are of the same size, and are 

 equally prominent behind ; the intercondyloid space is wider than 

 either condyle ; there is a depression in it, bounded above by a 

 transverse ridge. The bridge is broad, median, and nearly transverse ; 

 the canal is rather oblique. The posterior condyloid surface is 

 divided by a median longitudinal rising. The sides are slightly con- 

 cave ; there is a low protuberance in the inner one. 



The Crow {Corvus corone) shows but a feeble rudiment of the 

 ridge at the narrow posterior condyloid surface : the anterior inter- 

 condyloid space equals each condyle : the depression in it is well 

 marked : the bridge is broader than in the Raven. The tubercle in 

 the shallow entocondyloid surface is minute. 



In the tibia of the Hornbill (Buceros), the pro- and ecto-cnemial 

 ridges are rudimentary. At the lower end of the bone the breadth of 

 the condyles exceeds their depth : the inner condyle is longer, broader, 

 more prominent posteriorly, but not anteriorly, than the outer one. 

 The intercondyloid space equals the outer condyle : the depression in 

 that space is deep, and well-defined by the superior transverse bar : 

 above this the narrow ligamentous bridge remains unossified. Poste- 

 riorly the condyles are divided by a deep and narrow longitudinal 

 groove ; the sides are slightly concave. 



Order Scansores. 



In the Parrot (Psittacus) the breadth of the condyles exceeds the 

 depth : the intercondyloid space is rather broader than either condyle, 

 and retains its depth and breadth from the fore to the back part of 

 the trochlese. The intercondyloid fossa is a transverse groove at the 

 lowest part of the space. The bridge is unossified. 



In the Woodpecker (Picus viridis) the procnemial ridge extends 

 down the inner side of the proximal third of the shaft. The breadth of 

 the condyles a httle exceeds their depth : the intercondyloid space is 

 broader than each condyle, which are equal in degree of convexity 

 and prominence anteriorly : the condyles contract to mere ridges 

 behind. Here the space is di^dded by a low median longitudinal 

 rising. The intercondyloid fossa is broad and deep. The bridge is 

 broad ; its lower outlet forms a small foramen. 



Family Columbid^. 



In the Crown-Pigeon {Lophyrus coronatus, fig. 5) the depth of the 

 inner condyle exceeds the breadth of that end of the tibia. The 

 anterior convexities of the condyles are subequal, the inner one being 

 rather more prominent. The intercondyloid space is of the breadth 



