68 ME. C. W. ANDEEWS ON THE SKULL AND 



have been small and have articulated with the bases of the ceratobranchials (c.bb.). 

 These are thin, slightly curved rods of bone, the anterior ends of which are enlarged 

 and bear the surface for the articulation with the first basibranchial. The posterior 

 ends are also slightly expanded and terminate in convex facets, apparently for union 

 with another element. 



In the Albatross the entoglossal is relatively very much smaller, the first basibranchial 

 (basihyal) broad and short, and prolonged backward into a long urohyal, so that the 

 articular surfaces for the ceratobranchials are widely separated. 



In Grus the entoglossal is very long, slender, and unossified ; the first basibranchial 

 (basihyal) is also long and slender, but, as in the fossil, the ceratobranchials articulate 

 with two contiguous surfaces on its hinder end, and the uroglossal is distinct and 

 articulates between the bases of the ceratohyals. 



In Cariama the two elements forming the entoglossal are partly separated by a 

 median foramen and are prolonged into postero-lateral processes behind the articulation 

 with the first basibranchial. This is a short bar of bone terminating in a pair of 

 surfaces for the ceratobranchials. The urohyal is very small and is not in contact 

 with the first basibranchial. 



In the Birds of Prey the ossified portion of the entoglossal is, as a rule, deeply bifid 

 anteriorly, the two elements forming it being united for a short distance only. The 

 first basibranchial is somewhat elongate and is prolonged backward into a uroglossal 

 process. 



In the Storks the entoglossal is imperfectly ossified, and the first basibranchial is 

 similar to that of the Eaptores. 



On the whole, the hyoid of Cariama approaches the fossil most nearly. 



The Coracoid. (Plate XVII. fig. 1.) 



The coracoid is particularly remarkable for its great length and slenderness, and for 

 the reduction of the acrocoracoid (ac.) process. 



At the sternal end the bone is almost 32 mm. wide ; its anterior face is convex 

 from side to side, and the posterior fiat or rather concave. The articular facet for the 

 coracoid groove of the sternum is large and well defined ; it extends from side to side 

 of the distal end of the bone both on the anterior and posterior face. At about 

 its middle it is overhung by a very prominent tuberosity, from which a shelf-like 

 projection runs to the inner border of the bone ; the union with the sternum must 

 ha\e been very strong. 



There is no distinct processus lateralis (jp.l-), its place being occupied by the convex 

 outer border ij>-L) of the expanded distal end. On the anterior surface a linea aspera 

 runs from the inner angle upward and inward, joining the ridge marking the outer 

 border at about ^ of the length of the bone from its distal end. The shaft towards its 

 upper end is slightly compressed laterally. The total length of the bone is 157 mm. 



