THE SENSORY ORGANS. l\ 



side the capsule of the neuroblast, with which it is connected 

 by the optic stem. 



The antennal ganglia (PL III., Fig. 2) exhibit a peculiar 

 grouping of cells in small spherical masses, imbedded in a reti- 

 cular substance. The infra-cesophageal ganglia have a similar 

 structure, but each has a single large group of cells arranged in 

 concentric layers (PL III., Fig. i, s) with smaller lateral 

 groups (/) scattered through the reticular substance. 



The description of the splanchnic nervous system will be 

 more conveniently given after I have described the remaining 

 structures of the larva. 



8. THE SENSORY ORGANS AND PERIPHERAL NERVE 



TERMINATIONS. 



With the exception of the sensory papillse, described on 

 p. 36, the only special sensory structures I have been able^to 





FIG. 12. i. A section of the terminal joint of the Maxilla, showing the eye-like 

 organs ; 2. A section of the eye-like organ ( T V oil immersion lens) ; j. Endings 

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

 Viallanes). 



discover are the pair of eye-like organs at the extremity of each 

 maxilla. Newport recognised the existence of similar struc- 



