X 



14. nerve of siphonal retractors. 



15. „ „ crista statica. 



16. „ „ macula statica. 



17. siplional 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. 

 oi to base of arms. 



■ Bc'g. brachial nerve ring and ganglia. O.G. outline of the optic ganglion. 



B.G. suprabuccal ganglion. Pe-G- pedal ganglion. 



B.G.Mnfrabuccal „ Pr-G- propedal ganglion. 



C.G. cerebral „ ^''^ ^- ''^ceral 



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



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



C. transverse section » n " » ^ ._, cu f n „ 



D. median sagittal section „ „ visceral „ showing the chiasma of the fibres of the 



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. 



SIN. siphonal nerve. 



