10 PHYSIOLOGICAL SBRIES. 



expand, somewhat at its distal end and is capped by 

 a number of closely packed nuclei, surrounded by a limited 

 amount of protoplasm. Small ganglion-cells of a simitar 

 nature (gang)ionic nuclei) are found in connection with 

 the sensory centres in many Invertebrates, and in this 

 i.Manoethey complete the striking resemblance that these 

 talked structure* bear to the fungiform bodies of Insects. 



It is to be noticed that the neuronile at the base of 

 ..talks iscondcnsed here and thereto form glomeruli similar 

 to those found in the olfactory centres of Arthropods and 



Fig. 6. 



G.N. 



.-A::',,-' ' // , 



GL. 



G - c 



r. B . 

 ection through the Brain of Aphrodite acideata. X 50. 



0. Kooi of OBtopbaged connective. I'M'-. ! i -brain. G.C. Ganglion- 

 .merull G.N. Ganglionic nuclei. M.li. Mi.l- 

 a Sulk of " fungiform body." S.T. Supporting tissue. 



Vertebrates. The n-lations of tin- ''lungiform bodies" to 

 thecephnl -organs M doubtful. The cerebral ganglion 



is enclose* 1 in a thick nptalft composed of large granular 

 stellate Cell* lodged within a loo-<- vacuolated conneelive 

 tissue; a protecting and >ii|>|MU-ting layer of somewhat 

 similar Structure \ pmenl an.nnd the ^cerebral g:inglion 

 and ventral conl of (i.-j.liyn-.-i. In the meshes of this 

 tissue lie a number of moderate-sized ganglion-cells, 

 funning a sparse layer around the brain. A pair of long 

 slender connectives pass on cither side of the pharynx to 

 the anterior ganglion of the ventral (bain. Each arises by 

 two roota derived respectively from the fore- and mid- 



