94 



stains very deeply, and many nuclei are apparent which 

 appear to lie at all levels with the exception of a narrow 

 zone bounding the free surface of the cells. 



The nerve fibrils break up into finer processes 

 amongst the ceJls^ and form a very complex network 

 around them. Many of the nuclei appear to belong to the 

 nerve fibres, whilst others much rounder and lighter 

 staining probably belong simply to supporting cells. The 

 nerve fibrils can be traced from their nuclei to the edge 

 of the hillock, where they are continued free as the long 

 cilia, so that these are in reality the terminations of 

 primitive neuro-fibrillae. 



Fig. 4. Section throuo;li abdominal sense-organ, x 300. 



There is, in addition to the covering of long cilia, 

 another much narrower " seam " lying at the bottom of 

 the cilia, and in fact having the appearance of a very 

 thick cuticle formed of a number of delicate parallel rods. 

 It has rather the appearance of another short layer of 

 stiff cilia. These rods can also be traced for a short 

 distance within the cells. 



