8o 



THE LIFE OF CRUSTACEA 



of larval stages. These larvae (Fig. 32) are all dis- 

 tinguished by the large size of the carapace, which 

 in some cases envelops the greater part of the body. 

 Some stomatopod larvae, in the w^armer seas, attain 



to a relatively great 

 size, sometimes exceed- 

 ing 2 inches in length, 

 and their glass-like 

 transparency gives them 

 a very striking appear- 

 ance. 



As we have seen, it 

 is exceptional to find a 

 free-swimming nauplius 

 larva among the Mala- 

 costraca, but it is the 

 commonest larval stage 

 in the other subclasses 

 of Crustacea. Most of 

 the Branchiopoda are 

 hatched in this form 



Fig. 32 — Early Larval Stage 



OF A Species of Squilla, prob (Fig. 33), and reach the 



ABLY S. dubia. X lo. (After j i^ ^ . , 



Brooks.) adult state by a very 



gr adu al series of 

 changes in which new somites and appendages are 

 added in regular order from before backwards till the 

 full number is reached. The Water-fleas (Cladocera), 

 however, differ from most of the other Branchiopoda 

 in having a direct development. The eggs are 



