MR. W. P. 



PYCKAFT ON THE OSTEOLOGY [Feb. 20, 



While in Conopophaga the median pair of sternal notches 

 a-opear 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 Ooraciiformes, that of the Bucconute 

 furnishing the nearest approach. But, whereas m the Bucconidse 

 the posterior-lateral and intermediate processes appear as though 

 given off from a common base— the margin of the deep scar tor 

 the origin of the sterno-coracoides,— in Hylactes the intermediate 

 process appears as though it had been cut out by stencilling from 

 the sternal plate itself, of which the posterior lateral process 



.?./>. 



p.l-/o-- f'lf 



\f''/l."-^-^- 



fi P:. 



s.e. 



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. Sylactes. b. Conopophaga. c. CincJodes. d. Pitta, e. Hylactes. 



«cr.=acrocoracoid. a.L^.=anterior lateral process. c.=carina. cL= clavicle, 

 cor. =coracoid. p.Z.^.= posterior lateral process. j9.r.= processus intermedins, 

 s.e. = spina externa. sc.= 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 tapers 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 

 coracoid. 



