PHYSIOLOGICAL SEHlK.s. 



ive development oi' a pair of outgrowths similar 

 in many respects to the fim^ifonii bodies of the Insect- 

 hrain (fig. 13). Eacli of them consists of an .arborescent 

 mass of peculiarly dense neiiropile coated by a thick layer 



.injzlionic nuclei : they cover the whole surfaee of the 

 protocerebral lobes with ihe exception of a small area on 

 the dorsal surface. Their function is entirely unknown. 



Fig. 13. 



in :ui enlarged model of the Brain of Limiiltu, after Viallanes. 



f'll.N. \i\i t'> cli-licera5. F.B. Fungiform body. O.G. Optic ganglion. 

 O.N. Optic nerve. (M'.C. Ocellary ganglion. OC.N. Ocellary 

 nerve. I'.L. I'rotocerebral lobe. SN. Nerve to sensory ]>it. 

 V.N. Visceral nerve. 



The lateral and posterior parts of the rin<j are n>mpo-ed 

 of six j'airs of o;n)n-Ji on i,. maSSefl intimately I'n.-ed to-vtliec 

 LoDgltadinally and united transversely by a series of coin- 

 nii-sures; the posterior pair are fused in the mid-line to 

 form a -in^le ' j,o-t-oral " ^annrlion. 



Seven pairs of integumentary nerves are ^ivm off 

 iVom tlie dorso*latera] margins of tlie rina. and from it^ 



