594 MR. F. E. BEDDARD ON THE [ Dec. 3, 
this group of Hornbills may be regarded as a distinct generic type— 
Bycanistes. Y am also inclined to think that Toccus is a distinet 
genus; it may be that the African forms are really distinct from 
the Asiatic ; but this is a matter that requires further study. 
Col. Tickell* has separated Aceros and those Hornbills such as- 
Toccus which are without casques from the other Indian Hornbills, 
and has remarked that the two genera, which he terms Aceros and 
Buceros respectively, have a different mode of flight. 
Aceros, however, in my opinion should not be generically separated 
from Buceros, the anatomical differences between the two genera 
being so extremely slight. 
Ceratogymna and Sphagolobus have a syrinx which differs in the 
non-fusion of the last tracheal rings from the syrinx of Buceros and 
particularly of Aceros, where the fusion between these rings is greater 
than I have observed in any other Hornbill. But this peculiarity, 
as also in the case of Toccus and Bycanistes, is correlated perhaps 
with the small size of the birds. 
2. On the Anatomy of Burmeister’s Cariama (Chunga 
burmeisteri). By Franx E. Bepparp, M.A., F.R.S.E., 
Prosector to the Society. 
[Received October 31, 1889.] 
Introductory. 
The specimen which forms the subject of the present paper was 
acquired by the Society in 1887 and died in 1888, being the fifth 
example * which the Society has obtained. 
The bird itself was discovered only thirty years ago (in 1859) 
by Dr. Burmeister, and was first described by Dr. Hartlaub* in the 
‘Proceedings’ of this Society. This description is confined to the 
external characters, and to an interesting account, from Dr. Bur- 
meister’s notes, of the habits of the bird. It is considered by Hart- 
laub to present differences of subgeneric value from Cariama cristata. 
Reichenbach afterwards * placed it in a separate genus, a proceeding 
which is approved of by Mr. Sclater®. A figure of the bird * 
illustrates Mr. Sclater’s note which has just been referred to. 
Later Dr. Burmeister? gave a somewhat fuller account of its 
external characters, agreeing with Reichenbach in distinguishing it 
generically. 
Dr. Gadow has given® some account of the visceral anatomy of 
1 Birds of India (MS.); this work is in the Society’s Library. 
2 Sclater, P. Z. S. 1887, p. 319. 
3 “On a new form of Grallatorial Bird nearly allied to the Cariama (Dicho- 
lophus cristatus),” P. Z. 8. 1860, pp. 335-6. 
4 Die vollstandigste Naturgeschichte der Tauben, ete. p. 159. 
5 P. Z. 8. 1870, p. 666. 
8 Loe. cit. pl. xxxvi. 
7 Reise durch die La Plata-Staaten, Bd. ii. p. 506. 
® Journ. f. Ornith. Jahrg. xxiv. (1876) pp. 445-6. 
