LOBSTERS, CRAW-FISH, AND SHRIMPS. 307 
life they do not long enjoy, for in about forty days they lose 
their natatory organs, and, no longer able to keep on the surface, 
they sink to the bottom, and there betake themselves to the 
A CRAW-FISH DISTENDED WITH EGGS. 
crawling, hiding life of their forefathers. Increasing in size, they 
gradually approach the shore, and at length occupy the places 
frequented by their past generations. 
The form of the larva differs so much from that of the adult, 
that it would be difficult, indeed impossible, to determine their 
species, if we did not almost witness the hatching. Hence we 
U 2 
