1872.] 



ON THE BIEDS OF CELEBES. 



151 



younger birds. Thus the dark chestnut-brown feathers on the crown, occiput, and nape appear 

 more isolated, the much paler hue of the neck-plumage forming a greater contrast. In other 

 respects there are no characters whereby the younger may be distinguished from the older birds, 

 save the somewhat smaller general dimensions, and the form, proportion, and adjuncts of the bill. 

 After the full plumage has been acquired, the bill still passes through three very distinct stages of 

 structure. In the younger (fig. 1) the casque looks more like an inflation of the culmen than a 



Fis. 1. 



//'^ 



Cranorrliimis cassidix, J juv. 



Fiff. 2. 



Cranorrhinus cassidix, J juv. 



separate part of the maxilla, so little is it detached. It is swollen posteriorly, and already reaches 

 to above the eye. Anteriorly it fiills rapidly towards the culmen without exhibiting an erect Tr.Z.S vm. 

 edge. The cutting-edges of the mandibles are not broken or serrated. In the mature bird the 

 bill measures two inches more than in the younger ; yet in the younger bird the mandibles are 

 as high, or are higher, throughout their length than in the fully adult ; or, in other words, in the 



x2 



