190 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 



of Jaueck '10, 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 Ijodies 

 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 Eemy '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 '16, Tulk '43, Leydig 

 '62, Saint Eemy '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 



