(3/4.

In South America I collected altogether twenty-seven species of mice, and thirteen more are known from the works of Azara and other authors.

Those collected by myself have been named and described by Mr.Waterhouse at the meetings of the Zoological Society.

I must be allowed to take this opportunity of returning my cordial thanks to Mr.
Waterhouse, and to the other gentleman attached to that Society, for their kind and most liberal assistance on all occasions.) The largest gnawing animal in the world, the Hydrochaerus capybara (the water-hog), is here also common.

One which I shot at Monte Video weighed ninety-eight pounds: its length, from the end of the snout to the stump-like tail, was three feet two inches; and its girth three feet eight.