THE ARTHROPODA 109 



by the addition of two more segments, making ten in all, 

 of which the first seven bear limbs in a more or less developed 

 condition. The limbs of the first five pairs have developed 

 exites as well as endites, and begin to resemble the typical 

 limbs of the adult. The second maxillae are represented by 



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Fig. 24 



^4. Lateral view of the metanauplius larva of A^pus cancriformis. B. The same larva 

 seen from the ventral surface. C. Ventral view of a larva after the first ecdysis. D. 

 Ventral view of a larva after the third ecdysis. E. A single thoracic limb of a larva 

 of the same age as that shown at D. All the figures after Claus. 7, the first 

 antennae ; 2, the second antennas ; J, the mandibles ; ag, antennary gland, the 

 . provisional excretory organ of the larva ; an, anus ; br, bract ; e, eye ; en, endites ; 

 /?, flabellum ',fo, frontal organ ; tk, thoracic segments. 



a pair of minute outgrowths lying just behind the rudiments 

 of the first maxillae. The biting process of the mandible is 

 larger and stronger, and its inner edge is furnished with two 



