GKUIDiE. 161 



groove (as in the Anseres) is placed intenially to the middle line of 

 the shaft, and its aperture below the bridge is elongated transversely. 

 The distal condyles are widely separated on the anterior face, the 

 outer one being much the larger of the two ; and the posterior 

 trochlear surface is stiU. shorter and wider than in the Ciconiidce. 



The femur has no pneumatic foramen. 



The furcula, which may bo anchylosed witli the carina of the 

 sternum, is V-shaped. The coracoid is short and stout, with a very 

 oblique and much expanded sternal border ; the byosternal process 

 is truncated and terminates in a small tubercle ; the internal steruo- 

 coracoidal surface is very deep, and has an enormous pneumatic 

 foramen ' ; the intermuscular ridge on the ventral or anterior sur- 

 face is very prominent, extending throughout the length of the bone 

 and forming a crest superiorly ; the subclavicular process is large 

 and recurved, with a foramen on the inner side ; the scapular fossa 

 is slight, and the glenoid ca\ity large and ovoid. 



The wings are shorter than in the Ciconiidie, owing to the cir- 

 cumstance that the ulna is only slightly longer than the humerus. 



The humerus is relatively larger and more massive than in the 

 Ciconiida' ; the head is much larger than the trochanter, and the 

 coraco-humeral groove very shallow ; the subtrochanteric fossa is 

 deeper than in the Ciconiidce, and the delto-pectoral crest thicker 

 and more prominent. At the distal extremity the condyles are 

 larger, and the ectepicondylar prominences less developed ; the sur- 

 face for the brachialis anticus is very large and rugose. 



Genus GRUS, PaUas^ 



The type genus. For palaeontological purposes this genus must 

 be taken to include all the existing members of the family ; the 

 characters on which Antliropoides, Tetrapteryx, and Balcmriai are 

 separated being, for the most part, not applicable to extinct forms. 



Gnis primigenia, Mihie-Edwards^. 

 Syn. (?) Grus turf a, Portis-*. 



Of large size ; the distal extremity of the tibio-tarsus having a width of 0,025 ; 

 extensor bridge of the tibio-tarsus elongated. 



' A similar foramen occurs in the PsopAnrf<B, but the sternal border of the 

 bone is much less oblique. 

 - Miscell. Zool. p. (i6 (17()6>. 



^ Oiseaux Fossiles de la France, vol. ii. p. 33 (1869). 

 * Mem. R. Ac. Torino, ser. 2, vol. xxsvi. p. 327 (1884). 



U 



