xl 



INTRODUCTION. 



Fiff. h. 



Fig-«- (fig. a,) to which the 



name of Zoea Taurus was 

 aftenvards given. Having 

 taken at sea several spe- 

 cimens of this singular 

 creature, he placed one 

 of them [a) in sea water, 

 which he constantly re- 

 newed, for the purpose 

 of observation, and, " on 

 the third day, finding its 

 movement become slower 

 and its colour paler, he subjected it to the microscope, 



and found to his surprise 

 that the anterior part of 

 the animal had changed 

 its form, and on the fourth 

 day it had acquired the 

 appearance represented 

 in fig. b, so that, together 

 with the other individuals 

 he had taken, it seemed 

 to have experienced a 

 complete metamorphosis ; 

 under this new form the 

 dorsal spine had disap- 

 peared, the front spine 

 had become compara- 

 tively small, the antennae 

 were rendered conspi- 

 cuous, the feet and eyes 

 were apparently more de- 



