FISHERY BULLETIN: VOL. 85, NO. 2 



ing between base of distal 0.25 and end of scapho- 

 cerite; ventral flagellum straight and long, although 

 broken in all specimens studied, in male with 22 mm 

 CL its length 2.1 times CL. 



Scaphocerite extremely long, surpassing anten- 

 nular peduncle by as much as 0.4 its own length; 

 strong lateral rib ending in sharp spine falling 

 considerably short of distal end of lamella. An- 

 tennal flagellum incomplete in all specimens ex- 

 amined. 



Third maxilliped sexually dimorphic: Males (Fig. 

 lOA, B) with penultimate article subtriangular in 

 cross section, its distomesial margin not produced 

 in conspicuous process but bluntly rounded; ultimate 

 article twisted, expanding from short, narrow base, 

 then narrowing and becoming concave laterally 

 before again expanding (sometimes almost imper- 

 ceptibly) distally; ventral surface with proximal, 

 transverse comb of long setae continuous with 

 lateral rows of minute spines extending to and 

 around distal extremity. Females with ultimate ar- 

 ticle (Fig. lOD), slender, but broadening slightly 

 mesially from short, narrow base, then tapering to 

 blunt apex. 



Pereopods not covered with setae; first and sec- 

 ond pereopods with broad depressed merus bearing 

 small, slender, distomesial spine. 



Abdomen with sharp dorsomedian carina extend- 

 ing along posterior 0.75 of fourth somite through 

 sixth, and produced in spine on posterior margin of 

 last 3 somites; sixth somite also bearing pair of 

 minute posteroventral spines and 2 elongate cica- 

 trices. Telson with median sulcus shallow, usually 

 distinct only along anterior 0.25 length of telson, 

 and flanked by pair of longitudinal dorsolateral 

 ridges; bearing 4 pairs of movable spines: 3 situated 

 at about 0.60, 0.75, 0.85 length from basal margin 

 of telson, fourth flanking short terminal part. Mesial 

 ramus of uropod surpassing apex of telson by as 

 much as 0.40 its own length; lateral ramus over- 

 reaching mesial ramus by as much as 0.33 its length. 



Petasma (Fig. 1L4, jB) with dorsomedian lobule 

 cincinnulate along entire mesial margin. Ventro- 

 median lobule extending distally almost as far as 

 dorsolateral lobule and bearing elongate, lapel-like 

 flap distoventrally along mesial margin. Dorsolateral 

 lobule sclerotized, not expanded distolaterally, with 

 lateral margin only slightly curved and distalmost 

 part broadly rounded forming subelliptical mesial 

 apex; ventral surface lacking setae, exhibiting con- 

 spicuous, slender, arched rib. Ventral costa almost 

 straight basally along 0.4 of its length, then turn- 

 ing somewhat abruptly distomesially, its rather 

 broad terminal part truncate (sometimes vdth disto- 



FlGURE II.— Psevdaristeiis crassipes, cr 26.5 mm CL, south of Cape Comorin, India. A, 

 Petasma, dorsal view of left half. B, Ventral view (specimen slightly distended). Scale 

 = 1 mm. 



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