354 Mr. Home's Description of the Anatomy 
The spleen is shorter and thicker than in the paradoxus ; hut 
has the same general shape. 
The kidneys and bladder are exactly similar to those of the 
paradoxus. 
The skull, in its general shape, is similar to that of the duck; 
and has not the bony falciform process observed in the paradoxus. 
The brain was not in a state to admit of particular exa- 
mination. 
The olfactory nerves are divided into numerous branches. 
The optic nerves are small ; and the fifth pair of nerves is 
much smaller than in the paradoxus ; the second branch, which 
in that species is very large, and supplies the upper part of 
the bill, is either extremely small, or altogether wanting. This 
animal has therefore, probably, a less acute sense of feeling in 
the bill than the paradoxus ; and, as the organ of smell is more 
complex, the increase of that sense may make a nice discrimi- 
nation by touch less necessary. 
The eye-lid is very loose upon the eye-ball, has a circular 
aperture, and appears to have great extent of contraction and 
relaxation. The membrana nictitans is wanting. 
The eye-ball is - 8 _ of an inch in diameter; the cornea JL, 
surrounded by a zone of a black pigment, in breadth. 
The organ of smell differs materially from that of the para- 
doxus. Immediately below the cribriform plate of the ethmoid 
bone there are bony processes, forming a cellular structure, 
nearly half an inch thick, which constitutes the principal part 
of the organ; from this there is a convex projecting turbi- 
nated bone, of a very slender form, extending half way to the 
external opening of the nostril, with a corresponding concave 
one to receive it, in each nostril ; and there is a small slit or 
