Pembekton, Sti'Hciurc of f/ic Optic 'r/ia/a///!. 1^7 



divides here and crosses its fellow inside of the ganglion, and 

 it and the ganglion degenerate after removal of the ganglia 

 habenuls. Not much is knov^^n of its physiological import- 

 ance, but it is probably rather a stimulating than a stimulated 

 centre of the habenular ganglia. The interpeduncular gan- 

 glion appears in all the vertebrates, being situated between 

 the mesencephalon and the metencephalon. In the fishes it is 

 of simple construction, and so also in the amphibians, being 

 composed of very small triangular cells. As mentioned 

 under " Meynert's Bundle," there are two kinds of fibres 

 distinguishable in this fibre-connection. Of these [Honegger, 

 ^' p. 408], the darkly stained ones enter into connection with 

 the cells present in this ganglion; the more lightly stained 

 ones go further caudad. 



LITERATURE. 



1. 1S70. Stieda: Studien i'lber das centrale Nervensystem der 

 Wirbelthiere. Zcitscl/rift f. ivisseiiscliafiUclic Zoologic, Band XX, 



2. 1S75. Stieda: Ueber den Bau des centralen Nervensystems 

 der Schildkrote. Zeit. f. -viss. Zool., Bd. XXV, p. 361. 



3. 1S80. Stilling: Ueber die centralen Endigungen des Nervus 

 opticus. ScJiuIfzc's Archil' f. inii:. Anat., Bd. XVIII, p. 468. 



4. 1S81. Bellonci: Ueber den Ursprung des Nervus opticus 

 und den feineren Bau des Tectum opticum der Knochentische. Zeit. 

 f. zviss. Zool., XXXV, p. 23. 



5. iSSi. VON Gudden: Mittheilung iiber das Ganglion interpedun- 

 culare. Arctiiz' f. Psyctiiafrie, Bd. XI, p. 424. 



6. iSSi. vonGuduen: Beitrag zur Kenntniss des Corpus mam- 

 niillare, und der sogenannten Schenkel des Fornix. ArcJiiv f. Psyclii- 

 atrie, Bd. XI, p. 428. 



7. 18S2. Mavser: Vergleichend anatomische Studien iiber das 

 Gehirn der Knochentische. Zeit. f. iviss. Zool.., Bd. XXXVI, p. 259. 



8. 1882. Rabl-ROckard: Zur Deutung und Entwickelung des 

 Gehirns der Knochentische. Archiv f. Anat., Jahrgang, 1882, p. iii. 



9. 1SS3. Ahlborn: Untersuchungen iiber das Gehirn der Petro- 

 myzonten. Zeit. f. -wiss. Zool., Bd. XXXIX, p. 191. 



10. 18S3. Bumm: Das Grosshirn der Vogel. Zeit. f. wiss. Zool., 

 Bd. XXXVIII, p. 430. 



11. Rabl-Ruchard: Das Grosshirn der Knochentische und seine 

 Anhangsgebilde. Arc/iix> f. Anat., yalirgat/o; 1883, p. 280. 



12. 1884. Ahlborn: Ueber den Ursprung und Austritt der I lirn- 

 nerven von Petromyzon. Zcitt. f. zviss. Zool,. Bd. XL, p. 286. 



