359 



tacles may be found in other tadpoles since the prepalatine is often 

 present. 



Tentacles are thus widely distributed and very variable struc- 

 tures. Müller regarded them and the labials as parts „not belon- 

 ging to the general plan of the vertebrates". Gegenbaur recognised 

 that this was no scientific account of labial structures and homolo- 

 gised them in Selachii with gill bars. However they must be regarded 

 as remnants of a complete system of organs, the oral cirri, and they 

 offer a good illustration of Darwin's principle that rudimentary organs 

 are highly variable. 



Manchester, Feb. 9th, 1894. 



Addendum. The recently discovered fossil, Palaeospondylus 

 gunni (Traquair) shows many remarkable features bearing on this 

 theory. It appears to be a Palaeozoic Marsipobranch with distinct 

 vertebrae. Round an aperture at its anterior extremity are eleven 

 tentacles, 5 pairs and one unpaired. Traquair considers this aperture 

 the nose but if on the other hand it is the mouth then an exact 

 comparison can be made between its tentacles and those of Myxine. 

 Traquair, Proc. Roy. Phys. Soc. Edinb., Bd. XII, 1894. 



Anatomische Gbesellscnaft. 



8. Versammlung in Strafsburg. 



Angekündigte Vorträge und Demonstrationen: 



1) Herr Altmann: Ueber Secretion. 



2) Herr von Koelliker: a) Ueber den Fornix long us von 

 Forel und die Beziehungen desselben zum Marke des Gyrus 

 fornicatus durch Fasern, die den Balken durchbrechen, wie 

 Ganser mit Recht behauptet und Honegger leugnet. 



b) Ueber das genauere Verhalten der Tractus ol- 

 factorii. 



3) Herr Tornier : Drei Vorträge, davon zwei über den Säugetier- 

 fuß. (Themen später.) 



c) Ueber die Striae acusticae des Menschen. 

 Demonstrationen: 



Herr von Koelliker: Außer den Belegstücken zu den Vorträgen: 

 Gehirnpräparate nach Golgi von der Maus, der Katze, dem 

 Kaninchen und dem Menschen und Nerven der Nebennieren. 



