190 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
of Janeck 710, Hilton ’12 and Haller ’12. There is a more 
careful consideration of nerve tracts in the more recent papers. 
Haller recognizes anterior and posterior pedunculated bodies 
which may correspond with the striated body of Saint Remy. 
One of the first papers dealing with scorpions was the one by 
Newport ’43. In this the general form of the nervous system 
and its branches is considered. A little earlier than this, 1832, 
Treviranus gave a less perfect account of the nervous system of 
this form. Saint Remy ’90 found a general agreement between 
the nervous systems of spiders and scorpions. Patten ’90 pub- 
lished a paper including work on this group. In his book of 
1912 there is also a considerable discussion of scorpions. The 
work of Haller ’12 is an important one in this connection. 
The literature on the nervous system of the other arachnid 
groups is very scanty. There is a paper of Borner ’04 on the 
Pedipalpida. Allen ’04 describes the nervous system of the 
cattle tick, as irregularly oval, pierced by the alimentary canal 
and penetrated by air tubes from opposite sides. The nerve 
trunks come off in pairs, five large and two small. Those who 
have studied phalangids are Treviranus 716, Tulk ’43, Leydig 
62, Saint Remy ’90. Gaubert ’93 describes ganglia in the feet 
of phalangids. Loman ’05 describes the nervous system in 
phalangids. The usual nerves are described and a number of 
small lateral and intestinal ganglia are figured. The numerous 
papers on the nervous system of Limulus will not be mentioned 
at this time. 
The species of Chelifer chiefly used in this investigation was 
scabrisculus, although a few specimens of fuscipes were exam- 
ined. The small size of the animals and the strong chitin do not 
make this group a favorable one for the detailed examination of 
the nervous system. However, the group in itself is interesting 
and the more general features of the nervous system and sense 
organs will be considered as completely as possible. 
The pseudoscorpions resemble scorpions in many external 
features, but seem to be closely related to spiders. The study 
of the nervous system seems to show a closer relationship with 
the spiders. In Vol. I, p. 621 of Parker and Haswell’s zoology 
