1867.] PROF. HUXLEY ON THK CLASSIFICATION OF BIRDS. 4.53 



Fie. 34. 



The palate of Ci/pselus apus ( X 2). 



The anterior excavated end of the vomer has a ci-escentic shape, its angles ter- 

 minating in free horns above the palatine bones, by which they are con- 

 cealed in the figure. The inferior ends of the prefrontal processes (*) have 

 a very peculiar form. 



Fig. 35. 



Under view of the skull of Caprimidgus curopcetoi ( X 2). 

 The letters as before. 



