142 OBSERVATIONS ON THE ANATOMY OF 
1 1 inch long, and the penis was throughout about half an 
inch in thickness. The glans was nearly cylindrical, slight- 
ly dilated on the fore part, and supported by a complicated 
bony apparatus. It presented a wide funnel-shaped cavity, 
unconnected with the urethra, and opening on the fore part 
by loose soft margins. This cavity, like the whole surface 
of the glans, was covered with small sharp curved spines, 
which were reflected backwards on tlie glans, and forward 
in the cavity. These spines, when viewed with a lens, were 
seen to be hollow curved cones, shaped like the horns of 
the rhinoceros. The whole extent of the upper surface of 
the glans was strengthened by a bony plate, much ex- 
panded at its back part, and affording attachment to two 
long sharp styliform bodies, whose points reached the ante- 
rior extremity of the funnel-shaped cavity of the glans. At 
the sides of the bony support of the glans, were placed two 
remarkable serrated osseous wings, with four or five sharp 
reflected teeth on their free margins. These bony serrated 
plates were loosely connected with the soft parts of the pe- 
nis, and rose erect on stretching the integuments to which 
they were attached; their surface has a smooth shining 
pearly lustre, like the two sharp styliform bones within the 
cavity of the glans. The urethra, lying immediately be- 
neath the osseous support of the penis, terminated within 
the anterior and upper margin of the funnel-shaped cavity. 
The great developement and peculiar character of the di- 
gestive system of this timid and defenceless animal, admir- 
ably adapt it for quickly converting vegetable into animal 
matter, and for checking the excesses of a luxuriant vege- 
tation in the wilds it inhabits. The remarkably developed 
state of its generative system, the great fertility of the ani- 
mal, and its peculiar propensities, cause it to multiply ex- 
ceedingly in the warm and fertile deserts of the New World, 
where it dwells secure in its subterranean burrows, remote 
