Page 60. 
316 ON THE GROUND-HORNBILL. 
develop into a true secondary cecum in the manner that it does in 
the Capybara. 
Whilst on the subject of the viscera of the Capybara, the following 
measurements of those of an adult male will not be out of place— 
small intestine 21 feet, large intestine 6 feet 7 inches, cecum 1 foot 
10 inches. ; 
The liver is comparatively simple. The gall-bladder is pyriform, 
situated in a cystic fossa, not reaching the free margin of the gland. 
The right central lobe is slightly more bulky than the left lateral, 
which is more than twice the size of the left central, which, again, is 
somewhat larger than the caudate. The Spigelian lobe is minute, and ~ 
bifid as in so many Rodents. 
51. ON A PECULIARITY IN THE CAROTID ARTERIES, 
AND OTHER POINTS IN THE ANATOMY, OF THE 
GROUND-HORNBILL (BUCORVUS ABYSSINICUS)* 
A sPEcIMEN of Bucorvus abyssinicus having recently died in the 
Society’s Gardens, I have had the opportunity of examining the 
anatomy of that genus for the first time. In all respects, except 
the one to be referred to as regards its arterial system and a minor 
myological feature, it agrees with Buceros. As is the case in all the 
Bucerotidez, there was not a trace of fat to be found on any part of 
the body of the adult bird, though it may be present in young 
individuals; and the air-cells extended so extensively among the 
muscles that on removing the skin no dissection was required to 
display each muscle from origin to insertion. The muscular tissue 
was also strikingly compact and dry, as in the Hares among mam- 
mals, in which animals also it is known that fat is never deposited. 
The oil-gland, as in Buceros, instead of being simply tufted, was also 
’ covered with a dense mat of short feathers, about a square inch in 
area. 
In Buceros, as in most birds, the two carotid arteries, immediately 
they separate from their respective innominate arteries, converge, and 
meet before they have gone any considerable distance up the neck, to 
ron together in the median hypapophysial canal on the anterior sur- 
face of the cervical vertebre. In some Parrots the left carotid, 
* “Proceedings of the Zcological Society,’ 1876, pp. 60,61. Read, Jan. 18, 
1876. 
