2C6 
ZOOLOGICAL GEOGRAPHY. 
[part hi. 
Anomahtrus, shows that this island has probably once been united 
to the continent. 
Prince’s Island, situated about 100 miles from the coast, has 
no mammals, but between 30 and 40 species of birds. Of these 
7 are peculiar species, viz., Zosterops ficedulina, Cuphopterus dohrni 
(a peculiar genus of Sylviidae), Symjrfectes princeps, Crithcigra 
rufilata , Columba chlorophcea, Peristera principalis , and Strix 
thomensis. 
In the Island of St. Thomas, situated on the equator about 150 
miles from the coast, there are 6 peculiar species out of 30 known 
birds, viz., Scops leucopsis , Zosterops lugubris, Turdus olivaceo- 
fuscus, Oriolus crassirostris , Symplectes sancti-thomce and Aplopclia 
simplex; also Strix thomensis in common with Prince’s Island. 
The remainder are ell found on the adjacent coasts. It is re- 
markable that in Prince’s Island there are no birds of prey, any 
that appear being driven off by the parrots (Psittacus erithacus ) 
that abound there ; whereas in St. Thomas and Fernando Po 
they are plentiful. 
III. South-African Sub-region . 
This is the most peculiar and interesting part of Africa, but 
owing to the absence of existing barriers its limits cannot be 
well defined. The typical portion of it hardly contains more 
than the narrow strip of territory limited by the mountain range 
which forms the boundary of the Cape Colony and Natal, while 
in a wider sense it may be extended to include Mozambique. It 
may perhaps be best characterised as bounded by the Kalahari 
desert and the Limpopo river. It is in the more limited district 
of the extreme south, that the wonderful Cape flora alone exists. 
Here are more genera and species, and more peculiar types of 
plants congregated together, than in any other part of the globe 
of equal extent. There are indications of a somewhat similar 
richness and specialization in the zoology of this country; but 
animals are so much less closely dependent on soil and climate, 
that much of the original peculiarity has been obliterated, by 
long continued interchange of species with so vast an area as 
