139 
A very large section of Gaubert's voluminous and 
valuable essay treats the lyriform and other sense- 
organs, but this section, the one I chiefly have investi- 
gated, is rather defective. The sole order in which he 
has found the most part of the existing lyriform organs 
is Aranece, and even here his description is not full. 
He has found but a small portion of the existing organs 
in Phrynidæ, Thelyphonidæ, Opiliones and Pseudo- 
scorpiones, and he is denying their existence in 
Solifugee and Scorpiones, though they are found in 
both orders and in the last-named attain a great 
development. This becomes still more disastrous 
because he makes use of the existence or not existence 
of the organs etc. to the exhibition of a »tableau». — 
The treatment of the characteristic »tactile hairs« is 
much too short, and he does not appear to know their 
existence but in Aranece and Scorpiones; he has not 
seen the characteristic sense-organs in Scorpiones, 
Chelonethi etc. The other sections of his essay are 
omitted or but occasionally mentioned here, as thev do 
not touch upon the territory of this paper. 
I shall begin by emphasizing, that it has not atall 
been my intention in this little essay, written down 
occasionally, to give anything like a complete representa- 
tion of the sense-organs of Arachnida, as the examina- 
tion of a material many times larger, especially of the 
order of the Thelyphonide and Opiliones, would be 
required for such a task; neither I have carefully studied 
the histological structure of the discovered organs. It 
has only been my intention to point out a 
great number of hitherto unnoticed sense- 
organs and other organs, and I do not doubt that 
(especially in Opiliones and Acari) there may be found 
many hitherto unknown organs. I have taken great 
pains in searching for the lyriform organs, but I do 
