148 



Ml!. W. P. PYCRAFT OX THE OSTEOLOGY 



[Feb. 20, 



Wliile in Conopophaga the meclian pair of sternal notches 

 appear to be closing, in Hylactes they seem to have reached 

 nearly the maximum development. To find a sunilar sternum 

 we have to search among the Coraciiformes, that of the Bucconidss 

 furnishing the nearest approach. But, whereas in the Bucconidse 

 the postei'^ior-lateral and intermediate processes appear as though 

 ^iven off from a common base— the margin of the deep scar for 

 the ori<^in of tlie sterno-coracoides,— in Hylactes the intermediate 

 pi'ocess^appears as though it had been cut out by stencilling from 

 the sternal ]ilate itself, of which the posterior lateral process 



i-'r 



,.i p.. 



Form of the posterior border of the sternum and the relations of the articulations 

 of the bones of the Shoulder-Girdle at the foramen triosseum. 



a. Hylactes. b. Conojiophaga. c. Cinclodes. d. Filta. e. Hylactes. 



ocr.=acrocoracoid. a.Z.jo.=anterior lateral process. c.=carina. cL= clavicle, 

 cor. = coracoid. p.Lj).= posterior lateral process. j5.i.=processus intermedins. 

 s.e. = spina externa. «c.= scapula. 



forms the outer border. The two notches are subequal in 

 length, and do not extend beyond the middle of the sternal plate. 

 Again, in the Bucconid sternum the sternal plate tapeis rapidly 

 to a point, meeting at the hinder end of the carina, while in 

 Hylactes, though much incised, the hinder end of the sternal 

 plate, though narrow, is at least nearly as wide as the base of the 

 c'oracoid. 



