_575_ 



right, and we get back to Arnold's old view, which is supported by 

 VAN WijHE, Hoffmann, Onodi, Dohrn (apparently) and myself. 



Krause ' ) considers that the oculomotorius ganglion of lower Verte- 

 brates is not the honiologue of the ciliary gaughon of Mammals, he 

 classes the oculomotorius as a true segmental nerve and its ganglion, 

 (ganglion ocidomotorii) is when present in Mammals only rudimentary. 



I need hardly say that there are really no grounds for this 

 supposition. From what one sees in Sharks a division of the ciliary 

 ganglion into two ganglia in some cases is not out of question, and 

 there can be little or no doubt but that the ciliary ganglion of lower 

 vertebrates is exactly homologous with the ciliary ganglion of Mammals. 



The conclusions arrived at in this paper are briefly stated the 

 following. 



The mesocephalic ganglion is the ganglion of a posterior root 

 of a cranial nerve; it is the homologue of the Gasserian, facial, or 

 glossopharyngeal ganglion. 



Its only nerve at the present time is the ophthalmicus profundus. 



The ciliary ganglion is developed much later than the 

 segmental cranial ganglia, and is not the ganglion 

 of a posterior root of a cranial nerve; it probably 

 belongs to the sympathetic. 



Freiburg i/Br., Juni 1887. 



Über die ersten Entwicklungsvorgänge bei Distaplia magnilarya, 

 Bella Valle, einer zusammengesetzten Ascidie^). 



Von Dr. M. von Davidoff in München. 



Die umfangreichen, sich täglich mehrenden Erfahrungen aus dem 

 Gebiete der Entwicklungsgeschichte haben uns gezeigt, welchen modi- 

 fizierenden Einfluß die mehr oder weniger mächtige Ausbildung des 

 Dotters auf die Entwicklung der Embryonalanlagen ausübt. In der 



1) Kbause. Über die Doppelnatur des Ganglion Ciliare. Morphol. 

 Jahrbuch. Bd. VII. p. 43. 1880. 



2) Della Valle, Nuore contribuzioni alia storia naturale delle As- 

 scidie composte del Golfo di Napoli. Memorie Accad. Lincei, Vol. 10, 1881. 



Das Material zu dieser Untersuchung verdanke ich der Güte der Zoo- 

 logischen Station in Neapel, speziell dem Herrn Konservator Salvatoke 

 Lo Blanco, dem ich hiermit meinen besten Dank sage. 



