PLATE V. 



dcm, Dorsarcoinniissure. 

 vcM, Ventral commissui'e. 

 .Si, Superior lobe separated into two 

 lappets by a sulcus. 



PL, Posterior lobe. 



cc, 'Ciliated canal to the exterior. 

 i»V, Lateral nerve-stem, with fibrous core 

 and cellular coating. 



i«j, Innervation for the respiratory part 



of the oesophagus (n. vagus). 

 pn. Innervation for the proboscis. 

 an. Cephalic nerves. 



Figs. 1-9. Eupolia giardii, n. sp. Reconstructions of the brain-lobes from a series of sectiona 



Figs 1, 2, 3, i, 8 represent the outward aspect, viewed from different sides. 



Figs. 5, 6, 7, 9 represent the fibrous core ; the extension of the ganglion cells enclosing this core being 



indicated by faint outlines. 

 Figs. 1, 5. Seen from above. 

 Figs. 2, 6. Seen from below. 

 Figs. 4, 7. Seen laterally and outwardly. 

 Fig. 3. Seen from behind. 

 Figs. 8, 9. Seen laterally and inwardly (after section of the commissui-e and removal of the left half). 



In figs. 5 and 6 the course of the ciliated canal is specially indicated ; in the former figure 



by a red outline. 



