87 
fo) | 
1889.] ON THE ANATOMY OF PICARIAN BIRDS. 
Dalgleish, and pointed out its resemblance to that of the Geese 
(Aaser). The egg was one of a clutch of four taken in October, 
1873, by Mr. E. Gibson (as described, ‘ Ibis,’ 1880, p- 166) near 
Cape San Antonio, Buenos Ayres. 
The following papers were read :— 
I. Contributions to the Anatomy of Picarian Birds:—Part I. 
On some Points in the Structure of the Hornbills. By 
Frank KE. Bepparp, M.A., F.R.S.E., &c. 
[Received October 5, 1889.] 
Under the above heading I propose to offer to the Society a series 
of notes upon the structure of Picarian birds which may form a 
parallel series to the valuable communications upon Passerine birds 
by Prof. Garrod and Mr. Forbes published in the ‘ Proceedings ’ of 
this Society. 
The anatomy of the soft parts of the Hornbills has not been 
much studied, excepting as regards those points which were made 
use of by Garrod in his scheme of Bird-Classification ; further 
details are, however, to be found in Gadow’s work upon Birds ', 
and in Max Fiirbringer’s recently published monograph upon the 
shoulder-girdle and muscles of Birds 2. 
Visceral Anatomy. 
The diver-lobes present some differences in different Hornbills. 
Commencing with Bucorvus abyssinicus, in which the right lobe 
is larger than the left, the series terminates with Buceros coronatus, 
in which the left lobe is larger than the right. The following table 
shows the relations of the liver-lobes in such Hornbills as have been 
examined *, 
Bucorvus abyssinicus. R>L. 
Aceros nipalensis. R>L. 
Buceros bicornis. R>L. 
Sphagolobus atratus. R>L. 
Bycanistes subcylindricus. R>L. 
Buceros plicatus. R=L. 
Buceros rhinoceros. R=L. 
Buceros coronatus. R<L. 
I have noticed a peculiarity in several species of Hornbills which 
is not found in all other birds. In all birds the two lobes of the 
liver are completely separated from each other by the umbilical 
ligament, which bears the umbilical vein (this appeared to be 
particularly large and well developed in all Hornbills which have 
* Bronn’s ‘ Klassen und Ordnungen des Thierreichs,’ Bd. vi. 
* * Untersuchungen zur Morphologie und Systematik der Vogel.’ 
* The greater part of these observations are to be found in MS, notes of 
Garrod and Forbes. 
39* 
