FISHERY BULLETIN: VOL. 71, NO. I 



Calyptopis II (Figures 2b, 3b) 



Measurements: TL, r = 2.50-2,74 mm, m = 

 2.63 mm; CL, r = 1.42-1.54 mm, m = 1.49 mm; 

 n = 18. 



Carapace with frontal margin produced into 

 small triangular spine and posterior margin 

 more pointed than in preceding stage; develop- 

 ing eyes may contain some pigment. Thoracic 

 segments forming; abdomen segmented, sixth 

 segment not separate from telson; posterior 

 margin of telson with small median 7th ter- 

 minal spine. 



Antennule (Figure 4d) with protopod divided 

 into 3 peduncular segments, there is stout seta 

 distally on inner margin of second segment and 

 a small dorsal lobe bearing 2 setae and a few 

 small spines on distal margin of third segment 

 at base of outer flagellum; outer flagellum with 

 about 9 terminal processes including 2 setae, 2 

 aesthetascs, and about 4-6 spinous processes; 

 inner ramus with about 6 terminal processes in- 

 cluding 1 seta and usually 5 spines, there is 1 

 subterminal seta on inner margin. 



Antenna as in calyptopis I. 



Mandibles (Figure 6d) asymmetrical, now dif- 

 ferentiated into incisor and molar areas, right 

 mandible with slender articulated spine with 

 spinule situated near molar area; right mandible 

 rotated in Figure 6f to show relative length of 

 lateral process. 



Maxillule (Figure 7c) with setae and spines 

 fully formed; endopod of 1 segment with 3 setae; 

 exopod with 3 plumose setae; basal endite with 

 4 stout spines armed with spinules; coxal endite 

 with 6 setae — 2 are small smooth setae, 4 are 

 setose and the largest bears strong spinules dis- 

 tally. 



Maxilla (Figure 7f) with full setation; en- 

 dopod of 1 segment with 2 setae; exopod rep- 

 resented by a single plumose seta on small setose 

 lobe; basal endite with 3 medial lobes, coxal en- 

 dite bilobed, lobes 1-5 with setation of 5-4-4-3-1 

 progressing distally, 1 seta on each of lobes 1-3 

 is situated on posterior face of maxilla, 1 mar- 

 ginal seta on lobe 2 is quite small. 



Maxilliped (Figure 8b) now with full medial 

 setation; coxa with 4 plumose setae, 1 seta is 

 relatively long; basis with 5 setae; proximal 



segment of endopod with 3 setae; 1 distal seta 

 on basis and 1 distal seta on first segment of 

 endopod are situated slightly submarginally on 

 posterior face, both are small and frequently dif- 

 ficult to locate; setation of exopod and terminal 

 segment of endopod is unchanged. 



Calyptopis III (Figures 2c, 3c) 



Measurements: TL, r = 2.90-3.40 mm, m = 

 3.14 mm; CL, r = 1.30-1.42 mm, m = 1.35 mm; 

 n = 34. 



Larva now appears more slender for its length; 

 carapace considerably altered, still forming nar- 

 row hood over eyes but in other respects more 

 like carapace of furcilia, frontal margin pro- 

 duced into small triangular rostrum, lateral 

 margins with small anterolateral spine below 

 eye and large posterolateral denticle, posterior 

 dorsal margin no longer tapering to point but 

 indented medially. Eye with 7 well-developed 

 facets arranged in a circle of 6 with seventh 

 central facet, and ommatidia with pigment. 

 Thoracic segmentation more distinct. Abdomen 

 with 6 segments, there is dorsal ridge or fold 

 around segment 1 and segment 6 carries bira- 

 mous uropods. Setation of telson unchanged. 



Antennule (Figure 4e) with distal lateral mar- 

 gin of basal peduncular segment produced into 

 strong lateral spine which extends to or beyond 

 midpoint of distal segment of peduncle; there 

 are about 5 groups of 2 setae each along inner 

 margin of this spine with spinules between 3 

 distal groups and a seta at base of spine on both 

 outer and inner margins; basal segment of pe- 

 duncle dorsoventrally flattened; the peduncular 

 segments bear plumose setae along medial mar- 

 gins with 2-2-3 setae on segments 1-3 respective- 

 ly, there are 3 small setae around distal margin 

 of segment 2, and 3 setae and setules on dorsal 

 lobe below outer ramus on distal margin of seg- 

 ment 3; outer flagellum with 2 aesthetascs, 3 

 setae, and about 4 small spines ; inner flagellum 

 with 3 terminal setae and about 3 spinous pro- 

 cesses. 



Antenna as in calyptopis I. 



Mandibles (Figure 6e) similar to calyptopis II, 

 medial teeth somewhat flattened. 



Maxillule and maxilla as in calj^Dtopis II. 



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