FISHERY BULLETIN: VOL. 85, NO. 2 



of branchiocardiac sulcus, delimited dorsally by very 

 shallow, sometimes indistinct, groove. 



Eye (Fig. 4B) with optic calathus relatively short, 

 length of mesial margin 1.0-1.3 times distal width; 

 mesial tubercle strong and variably situated between 

 0.15 and 0.35 length of mesial margin from base of 

 cornea. 



Antennular peduncle with stylocerite produced in 

 sharply pointed slender spine falling distinctly short 

 of, or almost reaching, mesial base of distolateral 

 spine; latter acutely pointed. Third article never pro- 

 duced laterally (Fig. 15A); dorsal flagellum about 

 0.4 length of antennular peduncle, reaching between 

 distal 0.2 and terminal margin of scaphocerite; ven- 

 tral flagellum long (although incomplete in all 

 specimens examined, in one male 20 mm CL it 

 length 3 times CL), uniquely sinuous, slightly 

 broadened just distal to apex of dorsal flagellum and 

 bearing narrow band of densely set small setae on 

 mesial margin of broadened part (Fig. 15^). 



Scaphocerite extremely long, surpassing anten- 



nular peduncle by as much as 0.4 its own length; 

 strong lateral rib ending in sharp spine falling con- 

 siderably short of distal end of lamella. Antennal 

 flagellum incomplete in all specimens examined. 



Third maxilliped in males (Fig. 155) with penulti- 

 mate article subtriangular in cross section, and not 

 produced in distal process; ultimate article slender, 

 slightly broadening mesially from short, narrow 

 base before tapering to apex (sometimes slightly 

 dilated proximal to tip); in females (Fig. 15C) pen- 

 ultimate article more slender than in males, ultimate 

 article broadening slightly from narrow base then 

 tapering to blunt apex. 



Pereopods not covered with setae; first and sec- 

 ond pereopods with broad, compressed merus bear- 

 ing small, slender, distomesial spine. 



Abdomen with dorsomedian carina extending 

 from fourth through sixth somite, carina low on 

 fourth, sharp and somewhat higher posteriorly, and 

 produced in small spine on caudal margin of each 

 somite; sixth also bearing pair of minute postero- 



A 



B 



C 



' M 





m 



Figure 15.— Pseudaristeus gracilis (Bate): A,cr20 mm CL, eastern Mindanao Sea, 

 Philippines, last article of right antennular peduncle and flagella, dorsal view. B, 

 same o", distal articles of left third maxilliped, dorsolateral view. C, 9 35.5 mm CL, 

 between Bohoi and Siquijor Islands, Philippines, distal articles of left third maxilliped, 

 dorsal view. Scale = 2 mm. 



830 



