CRUSTACEANS. 
483 
the second, three to four times the third, and two or three times the 
fourth year. In the fifth year they attain the adult state. Whence 
it follows, that the small lobsters served at our tables have changed 
their calcareous vestment something like twenty-one times, and are 
Row clothed in their twenty-second habit. 
Fig. 335. Corysles Cassivelaunus, male. 
The crabs are numerous in species and various in size. The long- 
clawed crab ( Corystes Cassivelaunus ) of Pennant and Leach (Pig. 335) 
ls remarkable for its long antennae, which considerably exceed the 
body. The jaw-feet have their third joint longer than the second, 
terminating in an obtuse point, with a notch on its interior edge; 
e yes wide apart, borne upon large peduncles, which arc nearly cviin- 
2 i 2 
