241 
are not numerous, and their fissures mostly also few, 
a’compound organ with fissures lying closely and 
regularly together as in Aranee is to be found only 
on the 2d joint of the legs in Chelonethi, and this 
organ is even small and the fissures a little removed 
from each other. In Scorpiones the body and the 
mandibles are quite devoid of fissures; groups of 
fissures are, however, found on the 2d—6th joint of 
the legs, besides on a couple of the joints of the 
palpi, but only one single group, namely the one on 
the anterior side of the 6th joint, is bearing considerable 
resemblance to a compound organ. In Solifuge not 
more than 2 irregular groups seem to exist situated on 
the lower side of the mandibles. (Koenenia is not 
examined). 
Thus there is a great difference as to the occurrence 
and arrangement of these organs in the 7 orders of 
Arachnids more closely examined; moreover, I have 
pointed out but a few leading features, many more 
peculiar features might be deduced from my special 
representation, but on the other hand, it must not be 
forgotten that many more types of the different orders 
must be thoroughly investigated before trying to give 
a more special picture of the occurrence and structure 
of the organs in the single orders in relation to each 
other. 
Almost all searching for the lyriform organs is 
undertaken on animals treated with cold caustic potash. 
The generally used method, viz., the boiling in caustic 
potash, I consider as not at all suitable to the 
purpose, the influence becoming easily too great, and 
consequently it becomes difficult to discover the organs. 
Here, as in all minute examinations of the parts of the 
chitine in Arthropoda, I prefer to clip a hole in the 
16 
