NOTES ON THE OSTEOLOGY OF SCANSORES. 
There are some exceptions to the general rules, which I have en- 
deayoured to lay down in the foregoing table, which is the case, not 
only in Ornithology, but in other sciences, particularly in Botany. 
In following out a general arrangement of birds, I should place the 
Raptores immediately before the Scansores and the Fissirostral 
group, for which I have before suggested the name of Volitores im- 
mediately after them. I think, also, that the Hornbills belong to the 
Fissirostral group, although they have generally been classed with 
the Crows. They have the same form of foot as in Halcyon, the 
same short tarsi, with the front deeply channelled ; the same elon- 
gated calcineal process; the same truncated form to the posterior 
end of the lower mandible; the same deep depression extending 
from the back part of the orbits and meeting at the occiput; the 
same strong osseous ridge extending down the sternum, from the 
junction of the coracoid to the outer edge of the posterior margin 
of the sternum; the same form of keel to the sternum; the same 
form of wing, the ulna and radius exceeding the humerus in length 
by one-third; the same straight scapula; the same form of Os 
Jurcatum ; the same abbreviated Os pubis, and the same truncated 
posterior margin to the pelvis. The skeletons of Buceros I pos- 
sess, are those of large species; it is therefore probable, that some 
of the smaller and weaker species would present still greater alli 
nities to the Kingfishers. 
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