116 NUDIBRANCHIATA.—TRITONIADA. 
Glaucus, I found the disc had been cleared of 
the tentacles and other soft parts, a small part of 
the fleshy portion only remaining upon the disc. 
Only one part of the horny disc exhibited any 
injury, and that appeared to be the place where 
the animal was first grasped by the Glaucus. 
‘When any of these animals came in contact 
with another in the glass, they did not display any 
annoyance, nor coil themselves up, nor did they 
evince any savage propensities one towards the 
other; and they would often float about having 
their digitated processes in contact one with the 
other, without exhibiting any signs of annoyance. 
Even when placed or pushed one against the other, 
they did not manifest any irritation, but remained 
undisturbed as in their usual moments of quiet 
repose. 
“Qn the back of the animal being seen in a 
strong light, a black line could be discerned on 
each margin, and passing down the centre of each 
fin; and sometimes varied by having two black 
lines on the upper part of one fin, although the 
opposite fin may display but one. 
“The margin between the falling of the purple 
colour of the back into the silvery white of the 
abdomen, often exhibited beautiful tints of a golden 
green; but these variations were probably produced 
by the effect of different rays of ight. These ani- 
mals soon perished; I could not preserve them for 
any length of time in the glass of sea-water, although 
the water was changed as often as it was thought 
necessary. The digitated processes of the fins were 
observed to shrink up on the death of the animal, 
and the process of decomposition rapidly took 
place, the whole body becoming a shapeless mass, 
