exxiv Proceedings of the Asiatic'Society of Bengal. \ August, 
subdivided into two Sub-orders (Oxopoei and Amblypygi) of 
which the latter contains one family only (Tarantulidae) and 
the former two (Thelyphonidae and Schizomidae). The Thely- 
already arrived at the following conclusions.—Taking first the 
Thelyphonidae, the denticulation of the first two joints of the 
arms is more variable than has commonly been supposed, and 
I have reason to believe that that of the first joint anyway has 
been determined by the long-continued action of climatic con- 
ditions; and it is noteworthy that almost all the other generic 
and specific characters are to be found in organs directly com 
nected with the processes of reproduction. A somewhat 
parallel evolution in some of these organs appears to have 
taken place in different genera; and they are apparently & good 
index of the degree of specialization found in the several 
ecies 
ies. 
Turning now to those genera which are distinguished by 
the presence of a ridge on each side of the head, we find that 
@ region including the islands of Sumatra, Java, Borneo,” 
Celebes is very much richer in species than any other locality 
and with the exception of a single rare species all the forms 
