FISHERY BULLETIN: VOL. 75. NO. 2 



imal extremity and mesial base of distolateral 

 spine; latter long, slender, and sharp. Antennular 

 flagella incomplete in all specimens examined by 

 me, according to Bate ( 1888) "about two-thirds the 

 length of the animal." Scaphocerite reaching as 

 far as antennular peduncle or barely overreaching 

 it; lateral rib ending in slender spine falling 

 slightly short of, or slightly overreaching, distal 

 margin. Antennal flagellum broken in specimens 

 examined by me, according to Bate ( 1888) "rather 

 longer than the animal." Mandibular palp reach- 

 ing to about distal 0.25 of carpocerite. Third max- 

 illiped overreaching antennular peduncle by 

 length of dactyl and propodus; length of dactyl 

 about 0.75 that of propodus. 



First pereopod extending to about distal end of 

 carpocerite. Second pereopod reaching distal end 

 of antennular peduncle, or exceeding it by as 

 much as length of dactyl. Third pereopod surpass- 

 ing antennular peduncle by length of dactyl, pro- 

 podus, and at least 0.25 that of carpus. Fourth 

 pereopod exceeding antennular peduncle by 

 length of dactyl, propodus, and 0.4-0.5 that of 

 carpus. Fifth pereopod overreaching antennular 

 peduncle by length of dactyl, propodus, and 0.75- 

 0.80 that of carpus. Pereopods increasing in 

 length from first to fifth. First pereopod with 

 minute spine on basis, and small one on ischium; 

 second pereopod with small spine on basis. Coxal 



plate of third pereopod in females broadening 

 mesially and produced posteriorly into setose, 

 rounded lobe. Tooth present on anteromesial 

 corner of coxa of fifth pereopod in both sexes, 

 strong and blunt in males, minute, and borne by 

 rounded coxal plate in females. 



Abdomen with middorsal carina from fourth 

 through sixth somites, posterodorsal margin of 

 fourth and fifth with short median incision, some- 

 times bearing minute spine at base; sixth somite 

 about twice as long as high, armed with small, 

 sharp spine at posterior end of carina and pair of 

 posteroventral spines. Telson with median sulcus 

 deep anteriorly, increasingly shallower poste- 

 riorly to level of base of lateral spines, flanked by 

 paired ridges, blunt anteriorly, sharp posteriorly; 

 length of terminal portion about 5 times its basal 

 width; spines moderately long, 1.20-1.35 basal 

 width of terminal portion. Mesial ramus of uropod 

 falling short of apex of telson, or overreaching it 

 by no more than 0.1 of its length; lateral ramus 

 exceeding mesial ramus by as much as 0.2 of its 

 own length, and armed with small, terminal, 

 distolateral spine. 



Petasma (Figure 14A, B) with row of cincinnuli 

 occupying about proximal 0.5 of median line, its 

 entire terminal margin lacking spines; ventro- 

 median lobule bearing two, rarely three, small, 

 triangular processes distomesially, and short, 



FIGURE 14. — Hymenopenaeus laevis, i 15 mm cl, Turks Island Passage, Bahama Islands. A, Petasma, dorsolateral view of left half. 

 B, Ventrolateral view. C, Right appendices masculina and interna, dorsolateral view. D, Ventromesial view. 



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