274 TlMEHRI. 
is ranked as one large zoological district, known as the 
Neotropical region, charafterised by the peculiarity of its 
animals, which are allied to, but markedly different from, 
those of temperate North America, which is ranked as 
a separate region ; while the Old World is divided into 
four separate regions. In the Neotropical, as in the 
other regions, there are certain districts which, though 
possessing forms generally corresponding with each other, 
yet are peculiar owing to the occurrence of other special 
forms localised in each. Thus this province is divided 
into the following sub-regions, (i) the tropical Ame- 
rican sub -region, north of Panama and south of central 
Mexico ; (2) the West Indian sub-region ; (3) the tem- 
perate South American sub-region, including the distri6ls 
south of Brazil and west of the Andes from Peru ; (4) the 
tropical South American or Brazilian sub-region, which in- 
cludes Brazil, Guiana, Venezuela, Ecuador, Columbia, etc. 
In this last sub-region there is a marked uniformity 
throughout — the animals being identical in all essential 
respe&s with those exhibited in the cases in the Museum 
as occurring in British Guiana — and while certain special 
forms are limited, or seem limited, to special areas, it 
would be rash to conclude, considering the vast distri6ls 
throughout the sub-region which have been very superfi- 
cially, or not at all investigated, that such forms are 
all certainly localised and have no wider distribution. 
— 
Up to this point, the visitor, if he has followed the 
account, has been gradually putting himself in the debt 
of the Museum, for information given — and there is only 
one method possible by which he can free himself, and 
that is, by affording the Museum the means of giving still 
