94 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
sides and also dorsally. The groups of larger cells were often 
surrounded by many others, both of the neuroglia type and of 
the smaller nerve cell form. In the largest neurones, as in the 
smaller ones, the nuclei are prominent with marked nucleoli 
which have one or more dark areas in them. Surrounding the 
nucleus there is a fine meshwork or cell reticulum upon which 
granules of tigroid substance may be seen. This material is 
in the form of fine granules in some cells, in others it is com- 
Vie 
WA 
Figure 1. Cells from the central nervous system of spiders, X800. A to E, cells 
from tarantula; D and E, supporting cells; F, nerve cell from a spider 
114%, mm. long; G, nerve cell or neuroblast from a young spider 
of about 114 mm. length. 
posed of coarser flakes. Running through the meshwork of the 
cell with its tigroid substance delicate continuous strands or 
neuro-fibrille may be seen and traced from the region of the 
nucleus into branches of the nerve cell. Adjacent cells may be 
seen to be in some communication with each other by means of 
these fine fibrille. Broader connections between cells such as 
Haller ’04 and Hilton ’11 have recorded in insects seem to 
oceur in this form to a limited degree (Fig. 1, A and B). 
