5 L. MURBACH. 



ulation. From the later experiments we may conclude that the 

 welt of pigmented tissue running around the margin of the bell 

 from papilla to papilla is not important, if at all sensitive to light. 

 And furthermore that the ovaries, tentacle and velum have prac- 

 tically no more to do with this function than other organs. In- 

 jury to the nervous system may account for the slow reaction 

 when the margins were removed for marginal welt of tissue and 

 the velum. If now none of these organs that have been tested 

 are solely affected by light, indeed only seem to slow the reaction 

 in proportion to the injury, it seems to indicate that the epithelial 

 tissue on the subumbrellar surface, in general, is the responsive 

 organ. 



