NO. 1573. PARASITIC COPEPODS— WILSON. 389 



pairs prominent. Abdomen two-jointed, joints the same size; anal 

 laminae large, well flattened, and armed with four large setae, of which 

 the inner one is separated from the other three. 



Ventral surface of the carapace with the same adhesion pads as m 

 the female. Second maxillipeds enlarged, sometimes with a terminal 

 claw and sometimes with pincher knobs, both varieties occurring in 

 the same species. The four pairs of swimming legs biramose, all the 

 rami two-jointed and armed with large plumose setse. 



(Pandarus, the leader of the Lycians in the Trojan war.) 



The distinguishing characters of a female Pandarus are the ])aired 

 dorsal plates on the free thorax segments, the rudimentary sixth seg- 

 ment, and the peculiarly modified anal laminae (fig. 15). Of the dor- 

 sal thorax plates, the first pair extend diagonally backward over the 

 lateral margins of the third pair and may even reach beyond the lat- 

 ter (satyrus). 



In some species (sinuatus) they are short and plum]i, with well- 

 rounded outlines; in others (satyrus) they are long and narrow, with 

 their lateral margins comparatively 

 straight. 



Between their bases lies an un])aired 

 median plate, which covers the remain- 

 der of this second segment and pro j ects 

 but a comparatively short distance 

 behind the posterior margin of the 

 carapace, either terminating in a fig. i7.-section of the genital seg- 

 straight line (sinuatus, satyrus, cran- ^^^"^ o^ pandarus sinuatus, with the 



-,..,, ,, /I • 7 \ SIXTH SEGMENT AND ABDOMEN STILL AT- 



c/m) , broadly concave (bicoior) or tacked, end view, showing the dis- 

 convex (smitJiii) , both the latter over- ^ance between the dorsal plate and 

 lapping the third segment. The bases 



of this first pair of plates are furthermore separated by so wide an 

 interval as to leave nearly the whole of the small second pair uncov- 

 ered between them. These latter are much the smallest j)air in every 

 species, and are more or less fused at the median line, the sinus 

 separating them being sometimes a mere notch at the center of the 

 posterior edge of the fused plates (cranchii) , or even entirely lacking, 

 so that the plates seem like one (brevicaudis) . 



Anteriorly their articulation is usually concealed beneath the pos- 

 terior border of the central plate of the second segment. 



The tliird pair of plates are the largest of the three and they overlap 

 the genital segment for a greater or less distance, sometimes nearly 

 covering it (armatus, smithii, satyrus). 



The rounded posterior extremity of the body is a second charac- 

 teristic of the genus ; this extremity is formed dorsally by a rudimen- 

 tary lobe or process representing the sixth thorax segment, which is 

 elliptical or oval in young females and does not completely fill the 

 sinus of the genital segment, but in mature females it fits tliis sinus 



