444 PROF. HUXLEY ON THE CLASSIFICATION OF BIRDS. [Apr. II, 



The only Trogon skull I have had the opportunity of examinmg 

 is that of T. reinwardti. It possesses basipterygoid processes, in 

 which respect it resembles Cajyrimnlgus, and is unlike all the other 

 genera which remain to be mentioned. The palatines have a general 

 resemblance to those of the Musojihagidce. The vomer seems to be 

 equally rudimentary ; and the maxillo-palatines, though less spongy, 

 unite in the middle line. 



Fig. 26. 



Under view of tlic skull of Cuctdns canorus. Fi-om a specimen in tlie Museum 

 of the Royal College of Surgeons. 



The letters as before. 



Among the Cuculidce, Ciiculus canorus is devoid of basipterygoids ; 

 the palatines are rounded off postero-externally ; the internasal sep- 

 tum is well ossified and unites with the maxillo-palatines. 



In Geococcyx the principle of construction is quite the same ; but 

 the postero-external angles of the palatines are distinctly indicated, 

 and the beak is produced into an elongated triangular form. A slight 

 oblique ridge marks oif the flat surface of the maxillary process of 

 the palatine from the excavated body of the bone. Leptosoma and 

 Phcunicophaus present no important differences from Geococcyx. 



In Bucco the general form and arrangement of the parts are as in 

 Geococcyx ; but the shorter palatines are produced postero-externally 

 into a distinct backwardly directed point ; the oblique ridge is much 

 more distinctly defined, and the antero-internal angles of the pala- 

 tines bend towards one another and nearly meet. 



Galbula closely resembles Bucco ; but the antero-internal angles 

 of the palatines completely meet. 



In Rhamphastos the only important difference from Bucco lies in 

 the circumstance that the antero-internal angles of the palatines not 

 only meet, but are united by bone, while the oblique ridge of the 

 palatines is obsolete. The rostrum moves on the skull by a hinge, 

 almost as freely as in the Parrots. 



