X 



14. nerve of siphonal retractors. 



15. „ „ crista statica. 



16. „ „ macula statica. 



17. siphonal nerve. 



18. nerve which is distributed to the lower side of the head. 



19. olfactory nerve. 



20. nerve which is distributed (?) to muscles of eye. 



21. „ „ „ „ to base of arms. 



Be. G. brachial nerve ring and ganglia. 0. G. 



B. G. suprabuccal ganglion. Pe. G. 



B. G. 1 infrabuccal „ Pr. G. 



G. G. cerebral ,, Vi. G. 



outline of the optic ganglion, 

 pedal ganglion, 

 propedal ganglion, 

 visceral „ 



TEXT FIGURE 16. Photographs of the giant nerve cell and its fibre. 



A. & B. adjacent sagittal sections thru the pedal ganglion. 



C. transverse section „ „ „ „ 



D. median sagittal section „ „ visceral „ 



giant cells. 



C. giant cell. \ 



F. fibre. 



M. epithelium of the macula statica. 



P.P. pedal process of skull in section. 



S. statolith lying in the cavity of the statocyst. 



Si.N. siphonal nerve. 



showing the chiasma of the fibres of the 



