184 BULLETIN OF THE BUREAU OF FISHERIES. 



happily obtained we can supplement Nordmann's account and present a complete life 

 history, with every stage figured and described. 



The nauplius. — General form elliptical, one-half longer than wide, not narrowed 

 posteriorly, with nearly parallel sides. First antennae uniramose, two-jointed, basal 

 joint twice the length of the terminal and unarmed, terminal joint tipped with two long, 

 plumose setae, two short spines on the inner margin, and a long nonplumose seta on the 

 dorsal surface. Second antennae and mandibles biramose, the exopod four-jointed, with 

 four plumose setae, the endopod two-jointed, tipped with two plumose setae, and with 



Fig. 2. — The metaaauplius of L. variabilis. 



a short spine on the inner margin of each joint. The balancers are straight spines, com- 

 paratively short and slender, and placed rather close together on either side of the 

 midline. There is no pigment of any sort in this nauplius, no eye is visible, nor is the 

 body transparent enough to show any of the internal anatomy. In these respects it 

 differs from the one described by Nordmann, but is like it in all essentials. 



The metanauplius. — The nauplii molted once and at the second molt passed into 

 a metanauplius stage. 



Body elongate, obovate, twice as long as wide, strongly narrowed posteriorly, with 

 evenly rounded margins. First antennae uniramose and two-jointed, the terminal 



