DEVELOPMENTAL PHASES 371 



The mandibles are uniramous and naked. 



The rudiments of the metanaupliar limbs are discernible through the skin. 

 Pseudometanauplius. 0-53-0-57 mm. Five specimens examined (Fig. zoe,f). 



The body is more elongated than in the previous stage, oval, and at the posterior end the rudimentary 

 telson can be seen. 



05mm 



0-2mm 



02 mm 



015mm 



0-3 mm 



Fig. 21. Nematoscelis megalops. a, first calyptopis, dorsal view; b, mandible; c, first maxilla; 

 d, second maxilla ; e, first thoracic limb. 



The antennae project forward, but are otherwise unchanged. 



The median eye and the rudiments of the ocular plates are visible. 



There are two to four pairs of spines at the end of the rudimentary telson. 



The carapace, metanaupliar limbs, and telson are encased in an extremely thin, transparent skin. 



Metanauplius. No metanaupliar stages were encountered. 



5-2 



