EEVIEW OF GENUS ARGULUS — MEEHEAN 



519 



witli two mesial spines of basal plate narrow and blunt, distal one 

 broad ; postmaxillary spines long. 



Swimming appendages about the same length, quite stout in male, 

 elongate in female; without flagella. Two anterior appendages of 

 male unmodified. Third one with a rounded knob on the dorsal 

 anterior side of the coxa, basis elongate with the socket extending 



Figure 47. — Arguhis fuscus: a, Respiratory areas ; h, ribs of suction cups ; c, male accessory 



organs of last two legs. 



along the full length of the posterior edge, which is drawn out into a 

 ventral flap. Fourth appendages of male very short and broad 

 dorsoventrally. Peg a large knob on the anterior surface of the 

 coxa; basis stout and horny, with a ridge forming a cup around the 

 peg. Precoxa a triangular-shaped segment with base of triangle 

 directed posteriorly and slightly lobed to form a natatory lobe 

 (fig. 47, c) ; in female modified into a boot-shaped natatory lobe 

 posteriorly. 



Taken on hogfish {Orthopristis chrysopterus) and silver perch 

 {Bairdiella chr'^ysv/ra) in Lemon Bay, Gulf coast of Florida. 



