THE MUSCLES AND NERVES. 



291 



glion cells near their termination (Fig. 12 hh, j), and end in 

 demilunes of granular protoplasm on the inner surface of the 

 hypodermis. Beside the end organs of the special senses, which 

 will be described hereafter, many of the cutaneous nerves termi- 

 nate in remarkable fusiform bi-polar cells. One or several such 

 cells are enclosed within a capsular prolongation of the nerve- 

 sheath. The central pole of each cell is continuous with a 

 tubular nerve fibre ; the peripheral pole is prolonged as a highly 

 refractive c^'lindrical process, which lies in the axis of one of 



Fig. 12 bis —I. A section of the terminal joint of the Maxilla, showing the eye like 

 organs ; 2. A section of the eye-like organ (yV oil immersion lens) ; y. Endings 

 of a nerve in the hypodermis, showing a peripheral ganglion ('a cotes de melon,' 

 Viallanes)— all from the Blow-fly larva. 



the transparent moderate-sized setae so abundant on certain 

 parts of the insect. Such sensory setaj are numerous on the 

 prosternum and the lips of the proboscis. They are pro- 

 bably organs of touch. Many of these encapsulated nerve-end 

 organs contain peripheral cells, which are smaller than the 

 •central fusiform cells, and are not apparently connected with 

 the nerve. They are perhaps concerned in the nutrition 

 of the end organs, and resemble the outer cells of the taste 

 buds of Vertebrates. 



