FISHERY BULLETIN: VOL. 78, NO. 2 



c f 



Figure 4. — Euphausia eximia, northern form. Mandible, posterior view: a, calyptopis I; b-e, furcilia III- VI; f, juvenile I. 



Maxilliped endopod with 5 or 6 setae on distal 

 segment. 



Leg 2 endopod 5-segmented with more than 2 

 terminal setae; exopod with 2-4 (3) setae; gill 

 sometimes with bud of third lobe; photophore pig- 

 mented. 



Leg 3 endopod 5-segmented with 2 terminal 

 setae and variable marginal setation; exopod with 

 or 1 (0) seta; gill with bud of third lobe. 



Leg 4 endopod unsegmented with or 1 (0) ter- 

 minal seta; exopod nonsetose; gill with two lobes. 



Leg 5 rudimentary, sometimes with buds of 

 exopod and gill. 



Leg 7 with bifid gill and developing photophore 

 visible. 



Bud of leg 8 sometimes present. 



Abdomen with 5 pairs setose pleopods; photo- 

 phores pigmented on segments 1 and 4 and form- 

 ing on segment 2. 



Telson (Figure 6f) still usually with 7 terminal 

 spines and 3 pairs posterolateral spines (2 of 336 

 larvae varied with 3 and 5 terminal spines); telson 

 of next instar sometimes visible beneath cuticle, 

 the following percentages (in parentheses) of ter- 

 minal spines were observed among 293 furcilia III 

 larvae: 7(L0), 6(0.3), 5(1.4), 4(2.4), 3(30.4), 2(15.7), 

 1(48.8). The setation pattern on inner margins of 

 middle and innermost posterolateral spines differs 

 from E . gibboides; the middle spine has 3 stronger 

 spinules separated by small spinules and inner 

 spine bears several spinules distally. 



FURCILIA IV (FIGURES 7D, 9A). — Carapace 

 with a few small spines on lateral margins of ros- 

 trum and stronger median spine. 



Antennular flagella with 8 or 9 segments, one of 

 the paired aesthetes on outer ramus no longer 

 bifurcate. 



320 



