240 
I find grounds to believe that they appear as single 
fissures in this family, at the least; but lacking a parti- 
cular material and knowledge to the literature, I have 
not further carried out the examination. An investigation 
might very likely be worth the trouble to a zoologist 
who is conversant in this large and difficult order. 
Concluding Remarks. 
I consider it as being unnecessary to work out a resumé 
of the very miscellaneous contents of this little treatise. 
The numerous headings and the table of contents on 
the last page will prove to be a sufficient guidance to 
everyone who wishes to find information about a sub- 
ject discussed here I shall only sei forth some remarks 
on the lyriform organs. 
These organs gain the highest development in 
Aranece which have real compound organs on the 
stalk of the abdomen, the mandibles, the maxillary palpi 
and in greater number on the legs, besides the spread 
fissures all over the body, except on the upper side of 
the abdomen (always devoid of organs?). Next to 
Arane® come Phrynide and Thelyphonid®, where 
the fissures are spread partly over the whole body, 
partly on the limbs, and appear as more irregular groups, 
but these groups are less numerous than in Aranee, 
or they are replaced by 1 single or only 2—4 fissures 
as on several joints in Theiyphonide, and only 1 com- 
pound Iyriform organ is found on each ambulatory 
limb, that is to say, on the 2d joint in Phrynide, and 
on the 6th joint of the 3 last pairs of legs in Thely- 
phonide. In Opttiones and Chelonethi they are, as in 
the 2 pieceding orders, spread as single fissures on the 
whole body, but more spread on the limbs, the groups 
