117 



tion, (that is, when this tardy animal is pleased to progress, wliich 

 appeared to me very rarely to meet with its inclination,) as if in some 

 ■way or other to direct the movements of the animal. 



" The Glaucus, after eating the tentacles and nearly the whole of 

 the soft under surface of its prey, left tlie horny portion, and re- 

 mained tranąuilly reposing upon the surface of the water after its 

 meal, the only motion visible in the animal being the playing of the 

 digits of its fins. The mutilated remains of the Porpita sank to the 

 bottom of the glass. 



" Soon after, another G/az/CMS began a devouring attack upon an- 

 other Porpita which had been placed in the glass, eating a little of 

 it and then ceasing after a short meal^occasionally renewing the at- 

 tack at short intervals. On examining the Porpita, which had been 

 partiaUy devoured by the ravenous 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 \\dth another in the 

 glass, they did not display any annoyance, or coil themselves up, 

 nor did they e^ince any savage propensities one towards the other ; 

 and they would often float about, having their digitated processes in 

 contact one with the other, ^ithout exhibiting any signs of annoy- 

 ance ; even when placed or pushed one against the other, they did 

 not manifest any irritation, but remained undisturbed as in their 

 usual moments of ąuiet repose. 



" On the back of the animal being seen in a strong light, a black 

 line could be discerned on each margin, and passing doAvn the centre 

 of each fin, and sometimes varied in 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 ofthe abdomen often exhibited beautiful tints 

 of a golden green ; but these variations were probably produced by 

 the efFect of difFerent rays of light. 



" These animals 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 necessar)- ; the digitated pro- 

 cesses of the fins were observ-ed to shrink up on the death of the 

 animal, and the process of decomposition rapidly took place, the 

 ■whole body becoming a shapeless mass, ha\'ing a bluish colour of 

 deadly hue for a short period, and then became of a blackish or 

 brownish black colour. I have seldom seen a gelatinous animal 

 ■vrhich appeared so firm -n'hilst in the water, that proved so speedily 

 to decompose -when removed from it ; even the beautiful purple of 

 the back, the silvery or enamel of the abdomen, and the silvery blue 

 of the sides, aU speedily vanish, indeed instantly disappear, upon the 

 death of the animal, as if it had been washed off; the expansive, de.- 

 licate, and beautiful fins and digitated processes are no longerseen; 

 they shrank up to nothing. 



" Even on taking the animal alive out of the water and placingit 



