1856.] OWEN — GASTORNIS PARISIENSIS. 209 



lines above the inner condyle. The lower and hinder trochlear space 

 is concave transversely ; the lateral surfaces are slightly concave. 



In the Seres Crane (Grus Antigone, figs. Sa,8b) the breadth 

 and depth of the condyles are equal. The intercondyloid space 

 (answering to the supercondyloid in the Argala) exceeds in breadth 

 either condyle ; of these the inner one is the shorter in vertical extent, 

 and is the more convex and prominent one : the outer and vertically 

 longer condyle slopes gradually to the wide mid-space, which shows 

 no special pit or depression. The canal leading to the bridge is 

 broad, but is defined by a well-marked ridge on each side ; the 

 bridge is to the inner side of the mid-line, is very broad, transverse, 

 with a transversely-oblong lower outlet pretty close to the inner 

 condyle, looking directly forwards. The chief peculiarity is a 

 tubercle, external to this aperture. The lower border of the outlet 

 defines, with the tubercle, or bounds above, the shallow intercondyloid 

 or supra- condyloid space ; but there is no special depression. The 

 posterior condyloid space is deeper than in the Gallince, especially 

 towards the inner side, the bounding ridge of which is well-marked : 

 the under surface is flattened. The outer side of the condyle shows 

 a middle low tubercular ridge ; the inner side is rather more concave, 

 with a rising near the base of the anterior prominent part of the 

 condyle. 



In the Common Stork (Grus nigra) the breadth of the condyles 

 anteriorly rather exceeds their depth. The trochlear space is rather 

 flattened at its under surface ; and in all the other modifications the 

 correspondence with the Grus Antigone is close. The fore part of 

 the trochlea is more remarkable for the tubercle external to the 

 bridge than for the depth of the depression (intercondyloid or super- 

 condyloid space) below the bridge. 



In the Heron {Ardea cinered) the depth a little exceeds the 

 breadth of the condyles : the intercondyloid space is twice the width 

 of the inner condyle, which is rather narrower than the outer one : 

 the bridge is broad, oblique, internal : the lower outlet is transversely 

 oval ; immediately above the inner part of the intercondyloid space, 

 which is shallow and has no special depression. There is no tubercle 

 or ridge upon the bridge ; the posterior trochlear surface is concave 

 transversely. 



In the Spoonbill (Platalea leucorodid) the depth of the condyles 

 exceeds the breadth. The intercondyloid space is deep, and is wider 

 than either condyle, which are narrow and prominent : the trochlear 

 surface is flattened below, and is shallow behind. The bridge is near 

 the inner border, and is broad and transverse : a low ridge is continued 

 from it outwards, which forms the upper boundary of the shallow 

 super- or inter-condyloid space : there is a slight special depression 

 in this space just below the outlet of the bridge. The ectocondyloid 

 surface is almost flat : the entocondyloid one has the tubercle for 

 the attachment of the lateral ligament. 



In the Hmmatopus the breadth of the distal end of the tibia 

 exceeds the depth. The intercondyloid space equals the outer and 

 exceeds the inner condyle : the outer one slopes more gradually to it : 



