JOURNAL OF ENTOMOLOGY AND ZOOLOGY 197 
ganglia of Phalangium as described by Loman ’05 seem to re- 
semble the peripheral masses of Chelifer although they seem to 
be more caudal in position. 
In addition to these cells and irregular masses about the 
central system there are a number totally or partially surround- 
ing the mandibular nerve some distance from the brain. 
There are scattered cells, apparently nerve cells, under the 
hypodermis and some of these may be similar to the peripheral 
plexus described in insects. Methylene blue used repeatedly 
failed to demonstrate such a plexus however. 
Nerve Cris or tHE Central Nervous System. The nerve 
cells are rather small, closely crowded together with large nuclei 
and very little cytoplasm. The cells vary little in size and present 
a uniform appearance in all parts of the central ganglia. Some 
of the cells have two or more processes, but most cells are uni- 
polar with the process directed out to the central mass of fibers. 
Cells in small groups may in places send their fibers in together, 
forming a distinct bundle. No demonstration of special granules 
of tigroid substance was made although the usual methods for its 
demonstration were used, but the large nuclei nearly always 
showed six or eight distinct masses of chromatin. Sometimes 
there was an indication of a larger body which may have been a 
nucleolus. In some cells instead of rounded masses of chromatin 
there were longer rod-like masses. 
The neuroglia cells were easily demonstrated. They had 
rather large nuclei and very little cytoplasm forming a mesh- 
work of strands. In the meshes of this network the nerve cells 
are arranged, much as Haller ’12 has described and figured for 
spiders. A delicate membrane of thin cells with prominent 
nuclei surrounds the nervous system as shown in Haller’s 
figures. 
Crit Armas. In the brain the nerve cells cover the central 
fibrous mass on all sides. The cells are most numerous at the 
cephalic and caudal ends and also laterally. In the mid-dorsal 
region they are least abundant, forming in places hardly a double 
row. The more cephalic ventral portions of the supra-esopha- 
geal ganglion are indistinguishably fused with the subesopha- 
