FISHERY BULLETIN: VOL. 77. NO, 3 



each stage. Posterior margins of abdominal so- 

 mites fringed with spines. 



ANTENNULE (Figure IB).— First antenna, or 

 antennule, has a simple, unsegmented, tubular 

 basal portion; plumose seta terminally; and ter- 

 minal conical projection bearing four aesthetascs: 

 one long, one short, and two of intermediate 

 length. 



ANTENNA ( Figure IC ).— Consists of inner flagel- 

 lum (endopodite) and outer antennal scale (exopo- 

 dite). Flagellum spiniform, unsegmented, about 

 three-fourths length of scale, and spinulose dis- 

 tally. Protopodite bears spinous seta at base of 

 flagellum, but no spine at base of scale. Antennal 

 scale distally divided into four joints, fringed with 

 17 heavily plumose setae along terminal and 

 inner margins. Distinct seta on outer margin at 

 base of terminal segments; another seta on outer 

 margin, near the protopodite. 



MANDIBLES i Figure ID).— Without palps m this 

 stage and all later zoeal stages examined. Incisor 

 process of left mandible has six teeth in contrast to 

 triserrate incisor process of right mandible. Left 

 mandible bears movable premolar denticle 

 (lacinia mobilis) and subterminal tooth only on 

 left mandible in all zoeal stages examined. 



MAXILLULE (Figure IE).— First maxilla, or 

 maxillule, bears coxal and basial endites and an 

 endopodite. Proximal lobe (coxopodite) has seven 

 spinulose spines terminally. Median lobe (basipo- 

 ditei bears five spinulose spines and a lai"ge setose 

 seta proximally. Endopodite originates from lat- 

 eral margin of basipodite and has three terminal 

 and two subterminal spines; two of the spines have 

 especially long spinules. 



MAXILLA (Figure IF). — Bears platelike exopo- 

 dite (scaphognathite) with six long plumose setae: 

 three on distal margin and three on proximal 

 margin. Endopodite has 10 nonplumose setae: 7 

 bear distinct setules. Basipodite and coxopodite 

 bilobed. Basipodite bears four setae on each lobe; 

 each seta has distinct pattern of setules. Coxopo- 

 dite bears 12 setae: 2 on distal lobe and 10 on 

 proximal lobe; 6 distal setae of coxopodite some- 

 what plumose, remaining 6 setae have few, if any, 

 setules. 



FIRST MAXILLIPED (Figure IG).— Most setose 

 628 



of natatory appendages. Protopodite not seg- 

 mented, bears 11 setae (7 of them spinulose i. En- 

 dopodite distinctly four-segmented; setation for- 

 mula 3, 4, 1, 1. Exopodite is long slender ramus, 

 segmented at base; exopodite bears two terminal 

 and four lateral natatory setae. Epipodite a single 

 lobe. 



SECOND MAXILLIPED (Figure IH).— 

 Protopodite not segmented; bears seven sparsely 

 plumose setae. Endopodite distinctly five- 

 segmented; fourth segment expanded somewhat 

 laterally; setation formula 5, 2, 1. 1, 3. Exopodite 

 with two terminal, eight lateral natatory setae. 

 No epipodite. 



THIRD MAXILLIPED (Figure II).— Protopodite 

 unsegmented, bears two setae. Endopodite dis- 

 tinctly five-segmented, about the same length as 

 exopodite; setation fon..ula 5, 3, 1, 1,3. Exopodite 

 has 2 terminal and 10 lateral natatory setae. No 

 epipodite. 



PEREOPODS.— Poorly developed, not segment- 

 ed, directed under body somewhat anteriorly 

 (Figure lA). First three pairs biramous (second 

 pereopod shown in Figure IJ). last two pairs uni- 

 ramous and slightly smaller than pairs 1-3. All 

 pereopods without setae. 



PLEOPODS.— Absent until Stage IV. 



TELSON (Figure IK).— Continuous with sixth 

 abdominal somite; slightly emarginate distally; 

 bears seven pairs of densely plumose setae. Fourth 

 pair of setae longest: length about one-half 

 maximum width of telson. Minute spinules at base 

 of each seta except lateral pair. A few larger 

 spinules on distal margin between bases of four 

 inner pairs. Enclosed uropods visible. No anal 

 spine. 



STAGE II ZOEA 



Total length of Stage II zoea (Figure 2AH.2 mm 

 ( range 3.9-4.6 mm; 5 specimens). Rostrum without 

 teeth, sinuate, projects somewhat dorsally. 

 Carapace bears two prominent, supraorbital 

 spines, one on each side of carapace; antennal and 

 pterygostomian spines clearly visible. All zoeal 

 stages examined except Stage I bear supraorbital, 

 antennal, and pterygostomian spines. Epipodite 

 slightly larger than in Stage I, but not bilobed. No 



