567 



was the homologuc of a spinal gaoglion. van Wjjue') following 

 these two observers retained the name Ciliary forthe mesocephalic 

 ganglion, but pointed out its homology, and distinguished it from a 

 ganglion situate in the third nerve which he called (and rightly) gang- 

 lion oculomotorii. 



In my paper on the branchial sense organs I also retained the 

 name, and to harmonise previous researches introducd the radix longa 

 in a later stage which I had imperfectly investigated. 



DoHRN^) emphasized the accuracy of van Wijhe's account, but 

 appears here and elsewhere to use the name Ciliary for the meso- 

 cephalic ganglion. Hoffmann =') named what is at any rate partially 

 homologous with the mesocephalic ganglion of Elasmobranchs ganglion 

 ophthalmicum, which is a synonym for ciliary, and (correctly) 

 called the ganglion oculomotorii by one of its synonyms viz Ciliary. 



His*) in his important investigations of human embryos has also 

 identified the mesocephalic ganglion as Ciliary, and writes thus: — „Vom 

 vorderen Ende (des Ganglion Gasseri) erstreckt sich ein verjüngter 

 Fortsatz bis hinter die Augenblase als 'Anlage des Ganglion Ciliare". 



From the above account and the examination of the figures given 

 by Prof. His I do not entertain the slightest doubt that what he thus 

 describes is really the rudiment (Anlage) of the mesocephalic ganglion. 



The conditions are exactly the same as in the Chick and as in 

 Elasmobranchii, and the mistake seems to have been first made by 

 Remak^), who also in the chick described as Ciliary ganglion what is 

 really the ganglion of the Ophth. profundus, i. e. the mesocephalic 

 ganglion. 



In Amphibians, and very probably in all Mammals, certainly in 

 Man, the mesocephalic ganglion is partly fused from the start with 



1) op. cit. pag. 20 et seq. 



2) DoHEN. Studien zur Urgeschichte des Wirbeltierkörpers. No. X. 

 p. 438. see also p. 470. Mitteil. a. d. Zool. Stat, zu Neapel, Bd. VI. 

 Hft. 3. 



3) HopfMANN. Weitere Untersuchungen zur Entwickelungsgesch. der 

 Beptilien. Morphol. Jahrbuch Bd. XI. Heft. 2, pag. 203. Plate XII. 



4) His. Anatomie menschlicher Embryonen. I. 1880. p. 44. Taf. IV. 

 Fig. 11—13 Gc. Taf. VII. Fig. A. 1 Gc. Also His. Über die Anfänge 

 des Peripherischen Nervensystems, p. 469. Taf. XVIII. Fig. 5. Archiv 

 f. Anat. u. Physiol. 1879. 



5) Eemak. Untersuchungen zur Entwickelungs-Geschichte der Wirbel- 

 tiere. 1855. p. 37. Figs. 37 u. 38. Accepted by Koelliker. Entwicke- 

 lungsgesch. des Menschen. 2*° Auflage. 1879. p. 615. 



