454 
TRANSFORMA TIONS OF INSECTS. 
the whole. The eye has become more pedunculated, and appears 
to be movable. The auditory hairs have increased in number. 
The sac-like vesicles, the germs of the pereipoda, have increased 
in length at the rate of a joint at every moult, and seven of these 
legs are visible. The future branchiae may be detected in the form 
of simple sacs. The chelae, or pincers, are seen on the first pair 
of legs. The pleon now has the seven segments proper to the 
the metamorphoses of Carcinus mcenas. 
I. A zo & i within the transparent tunic. 2. Zoea after several moults. 
3. Zoea still older, and without spines, and with walking legs. 
adult, and the three central rings have undeveloped pleopoda upon 
them. 
If we examine the growing animal after a few more moults, and 
when it has increased to about three lines in length, we shall find 
its outline still holding a resemblance, though a less close one, to 
the previous appearance. The form of the carapace scarcely 
differs except in the shorter relative length of the antennae and 
dorsal spines, and the whole animal appears stouter and more 
