304 ZOOLOGICAL GEOGRAPHY. (PART III. 
utan, and Paguma, one of the Viverride, in common with 
Sumatra ; as well as Rhinoscivrus, a peculiar form of squirrel, and 
Hemigalea, one of the Viverride, in common with Malacca. 
Sumatra has only one genus not found in any other Malayan 
district—Nemorhedus, a form of antelope which occurs again 
in North India. It also has Siamanga in common with Malacca, 
Mydaus with Java, and Rhizomys with India. The Malay Penin- 
sula seems to have no peculiar forms of Mammalia, though 
it is rich in all the characteristic Malay types. 
The bats of the various islands have been very unequally 
collected, 36 species being recorded from Java, 23 from Sumatra, 
but only 16 each from Borneo and Malacca, Leaving these out 
of consideration, and taking into account the terrestrial mam- 
mals only, we find that Java is the poorest in species, while 
Borneo, Sumatra, and Malacca are tolerably equal; the numbers 
being 55, 62, 66, and 65 respectively. Of these we find that 
the species confined to each island or district are (in the same 
order) 6, 16, 5, and 6. It thus appears that Borneo is, in its 
mammalia, the most isolated and peculiar; next comes Sumatra, 
and then Malacca and Java, as shown by the following table. 
Peculiar Peculiar 
Genera. Species. 
Borneo ... oe oe 4 ee os nf 16 
Sumatra ns ea 1 3 ee ais 5 
Malacca ae wae 0 ats ae tes 6 
Java an 0 6 
This result differs from that which we have arrived at by the 
more detailed consideration of the fauna of Java; and it serves 
to show that the estimate of a country by the number of its 
peculiar genera and species alone, may not always represent its 
true zoological importance or its most marked features. Java, 
as we have seen, is differentiated from the other three districts 
by the absence of numerous types common to them all, and by 
its independent continental relations. Borneo is also well dis- 
tinguished by its peculiar genera and specific types, yet it is at 
the same time more closely related to Sumatra and Malacca 
than is Java. The two islands have evidently had a very 
different history, which a detailed knowledge of their geology 
