48 CONARIO-HYPOPHYSIAL TRACT. 



of liis body, as in the animals below him whether vertebrate 

 or invertebrate. 



Fig. 11. 



, 0 



Profile diagram of head and brain of insect, with, fore part of the neural 

 and haemal tracts or centres, in the position thereby indicated. 



The letters of reference are : — a. Hgemoesophageal centre or " ganglion" 

 =fore brain. h. ITeuroesophageal centre or " ganglion "= hind brain. 

 c. Oesophagus traversing the crura cerebri, or connecting- cords, d, to the 

 neurostome in its course, e. Nerve (olfactory ?) to antenna. /. Optic 

 nerve. g. Ocellar nerve, h. Mandibular nerve. i. Lingual nerve. 

 7c. Maxillary and labial palpal nerves. I. Stomach, or alimentary axis, 

 m. Heart, or hsemal axis. n. Ganglionic cords, or neural axis=:myelon. 

 0. Foremost thoracic centre or " ganglion." 



Printed by Taylor and Francis, Eed Lion Court, Fleet Street. 



