572 



cephalic ganglion M.G. to the lower branch of the third nerve. (M. 

 O.II.) It has been figured thus by Schwalbe op. cit. fig. 11. 

 It probably corresponds to the radix longa of higher animals. 



The deyelopment of the ciliary ganglion. 



In much later stages as van Wijhe has stated the true ciliary 

 ganglion (ganglion oculomotorii of van Wijhe) is formed. The meso- 

 cephalic ganglion is then very much fused with the Gasserian. The 

 ciliary ganghon appears, as van Wijhe states, as a somewhat dumb- 

 bell shaped mass of cells on the lower branch of the third nerve; 

 viz that to the inferior oblique muscle. Fig. 5 shows its position, 



Fig. 5. Figure of actual vertical section. Acanthias. vulgaris. Shows 

 position etc of ciliary ganglion. Letters as fig. 4. 



form etc. very plainly. The figure is a caibera drawing of a sagittal 

 section of Acanthias. The ciliary ganglion C.G. is seen to lie quite 

 close to the inferior oblique muscle {i.o.m.) and as Hoffmann states 

 on the level of the optic nerve {II.). 



Hoffmann^) describes the development of the ciliary ganglion in 

 reptiles as an outgrowth of the mesocephalic ganglion (ganglion oph- 



1) Hoffmann. Op. cit. p. 210 — 211. Plate XII. Only 27 figures 

 on one small plate. Limits and direction of section for each figure 

 indeterminable. 



