SECTION OF NAKED-EYED MEDUSA. 107 
adjacent tentacles between which no cut was made 
continued unimpaired, while the sympathy between 
them and the other tentacles was destroyed. 
The nervous connections between the tentacles 
and the manubrium are of a more general character 
than those described between the tentacles them- 
selves; that is to say, severing the main radial 
nerve-trunks produces no appreciable effect upon 
the sympathy between the tentacles and the 
manubrium. ‘ 
The nervous connections between the whole 
excitable surface of the nectocalyx and the manu- 
brium are likewise of this general character, so that, 
whether or not the radial nerve-trunks are divided, 
the manubrium will respond to irritation applied 
anywhere over the internal surface of the nectocalyx. 
The manubrium, however, shows itself more sensitive 
to stimuli applied at some parts of this surface than 
it is to stimuli applied at other parts, although in 
different specimens there is no constancy as to the 
position occupied by these excitable tracts. 
Distribution of Nerves in Tiaropsis Indicans. 
We have seen that in Sarsia reflex action obtains 
between the manubrium and the nectocalyx; we 
shall now see that in Tiaropsis indicans something 
resembling reflex action obtains between the 
nectocalyx and the manubrium. The last-named 
species is a new one, which I have described else- 
where, and I have ealled it “indicans” from a 
highly interesting and important peculiarity of 
