THE METAMORPHOSIS OF A CRAB. 



221 



2. The lateral margins of the carapace are free from the 

 body. 



3. The antennse are long. 



4. The third maxillipeds are not flattened. 



5. The gills are on the basal joints of the limbs. 



6. There is a free, movable, joillted abdomen, used in 

 locomotion. 



7. There are numerous biramous swimming abdominal 

 appendages. 



8. There is a free telson. 



Fig. 115. 



Fig. 116. 



Fig. 115. — Third maxilliped of the same larva. (After Clans.) 

 Letters as in Fig. 114. 



Fig. 116. — Pereiopod of the same larva. (After Claus.) 

 Letters as in Fig. 114. 



h. Keep a larva in confinement until it changes into the 

 young crab (Fig. 117). 



i. The auditory organ. The integument of the megalops 

 [larva or of the very young crab is sufficiently transparent 

 to render the examination of the hearing organ possible 



