FISHERY BULLETIN: VOL. 80. NO. 3 



Antenna (Fig. 3D).— Similar in form and arma- 

 ture to first stage, with addition of minute hair 

 on exopodite opposite of simple seta one-third 

 from base. 



Mandible (Fig. 3E).— Increased in size, shape 

 and armature similar to first stage. 



Maxillule (Fig. 3F).— Endopodite and coxal en- 

 dite setation unchanged. Basal endite now with 



5 stout, 3 thinner setae plus 1 long plumose seta 

 on basal margin. 



Maxilla (Fig. 3G).— Endopodite, basal, and 

 coxal endite setation unchanged. Scaphogna- 

 thite with 5 long, thin, plumose setae proximally, 

 3 stout plumose setae on distal margin. 



Maxilliped 1 (Fig. 3H).— Coxopodite with 1 ven- 

 tral seta. Basi- and endopodite setation un- 

 changed. Exopodite with 6 natatory setae. 



Maxilliped 2 (Fig. 31).— Coxo-, basi-, and endo- 

 podite setation unchanged. Exopodite now with 



6 natatory setae. 



Color. — Overall darker golden brown than first 

 stage. Color much more intense at dorsal spine, 

 fifth somite, and telson. Lateral spines, rostrum, 

 maxillipedal endo- and exopodites transparent. 

 Deep golden hue around base of dorsal spine. 

 Other chromatophore color and position as in 

 first stage. 



Third Zoea 



Carapace length: 0.70 mm; 5 specimens exam- 

 ined. 



Carapace (Fig. 4 A).— Zoea much enlarged, dor- 

 sal, rostral, and lateral spines elongate, 2 pair of 

 interocular setae, posterodorsal knob more 

 prominent, posterolateral margin now with 4 or 

 5 setae placed as illustrated, irregular denticula- 

 tion ventral to setae present here and in all 

 stages. Posterodorsal margin of carapace with 3 

 setae. 



Abdomen and Telson (Fig. 4B). — Sixth abdomi- 

 nal somite now present, with small bluntly 

 rounded posterolateral process. First somite 

 with 3 dorsomedial setae, middle the longest. 

 Paired lateral knobs on second and third somites 

 enlarged, posterolateral processes on somites 2- 



5. Telson with interfurcal setal formula now 4+4, 

 innermost pair the shortest. 



Antennule (Fig. 4C). — Unchanged in form from 

 second stage, with 4 unequal aesthetascs. 



Antenna (Fig. 4D).— Similar to second stage, 

 exopodite now slightly shorter than protopodite. 



Mandible (Fig. 4E).— Similar in form and arma- 

 ture to second stage. 



Maxillule (Fig. 4F).— Endopodite and basal 

 endite armature unchanged, 1,5 and 8+1 pro- 

 cesses basally, respectively. Coxal endite with 

 5 setae plus 1 long plumose seta on basal mar- 

 gin. 



Maxilla (Fig. 4G).— Endopodite 2,2, as before, 

 basal endites 5,4, coxal endites now 5,3. Scaphog- 

 nathite setae increased to 10 thinner plus 6 stout 

 distal setae, separated by sparse hairs as illus- 

 trated. 



Maxilliped 1 (Fig. 4H).— Coxo- and basipodite 

 setation unchanged. Endopodite setal formula 

 now 2,2,1 plus spine replacing dorsal setae, 2, 

 4+1. Exopodal natatory setae 8. 



Maxilliped 2 (Fig. 41).— Coxo-, basi-, and endo- 

 podite setation unchanged. Exopodite with 8 

 natatory setae. 



Color. — Now appearing ocherous orange. Dorsal 

 spine, abdomen, and telson darkest. Lateral 

 spine with orange coloration on ventral surface. 

 Orange chromatophores: at base of rostral spine, 

 another midway to tip; on 2 or 3 basipodite of 

 maxillipeds. Sixth somite and telson each with 

 pair of orange-brown chromatophores medio- 

 ventrally. Other chromatophore pattern re- 

 mains as in first stage. 



Fourth Zoea 



Carapace length: 0.80 mm; 5 specimens exam- 

 ined. 



Carapace (Fig. 5A).— Similar in form to third 

 stage, elongate dorsal spine now with 5 setae on 

 anterior margin as illustrated. Posterodorsal 

 border now with 4 setae, posterolateral margin 

 with 6. V-shaped process on ventrolateral mar- 

 gin less blunt than previous stages. 



508 



