86 



HISTOEY OF CKUSTACEA. 



Chap. IX. 



is situated. The form in tliis Kaupli us -brood is ex- 

 tremely various, — it is sometimes compressed laterally, 

 sometimes flat, — sometimes elongated, sometimes oval, 

 sometimes round or even broader tlian long, and so 

 forth. The changes which the first larval stages under- 

 go during the progress of growth, consist essentially in 

 an extension of the body and the sprouting forth of 

 new limbs. " The following stage already displays a 



fourth pair of ex- 

 tremities, the future 

 maxillse." Then fol- 

 io w at once three new 

 pairs of limbs (the 

 maxillipedes and the 

 two anterior pairs of 

 natatory feet). The 

 larva still continues 

 like a Nauplius, as 

 the three anterior 

 pairs of limbs repre- 

 sent rowing feet ; at 

 the next moult it is 

 converted into the 

 youngest Cyclops- 

 like state, when it 

 resembles the adult animal in the structure of the 

 antennae and buccal organs, although the number of 

 limbs and body-segments is still much less, for only the 



^ Figs. 53 and 54. Nauplii of Copepoda, the former magn. 90, the 

 hitter 180 diam. 



Fig. 54. 4 



