350 



is supplied by an upgrowing branch of the Maxillaris and the parti- 

 cular portion of 3, (Kopf U' Müller) by a branch from the Ophthal- 

 micus profundus. In addition a small muscle is present running along 

 the connecting bar and innervated by the Maxillaris. 



Thus we see that the third tentacle is worked by a system of 

 intertentacular muscles supplied by nerves which proceed into the 



R. vox. sup. R. ophth. prof. 



Compressor / 

 des Mundes 



Zuruckzieher der Tentakeln 

 Motor nerve 



Zuruckzieher 

 des Mundrandes 



Zweiköpfiger Herabzieher 

 des Mundes (Kopf U') 



Cirrus 



Fig. 1. Diagram of Third tentacle of Myxine. 



Root piece 



Motor nerve = R. visceralis (Hatschek) 



Sensory nerve = R. cutaneus 

 (Hatschek) 



Ejaculatory muscles 

 Fig. 2. Cirri of Amphioxus (chiefly from Hatschek). 



