PA RASITIC COPEFODS— WILSON. 355 



twice the length of the shorter one. The outer margin of these plates 

 really extends forward to the reniforni pads of the second niaxillipeds, 

 so that if removed from the body the plates are found to be spindle 

 shaped, pointed at either end, about twice as long as wide and 

 attached nearly at the center of the inner margin, leaving both ends 

 free. A wide space between the bases of these plates and behind tire 

 posterior margin of the carapace is left uncovered or with a small cen 

 tral plate, as in some Pandarus species. Dorsal plates of the third 

 thorax segment smaller than the first pair, also elliptical, but nearly 

 horizontal or only slightly oblique, with their tips meeting and often 

 overlapping a little on the mid-line. Dorsal plates of the third pair 

 considerably enlarged, circular and extending across the entire width 

 of the body, their inner margins overlapping on the mid-line, their 

 posterior margins reaching some distance over the genital segment. 

 The posterior margins of the first and third pairs of plates are scal- 

 loped, the points ending in short and sharp teeth; the margins of the 

 second pair of plates are smooth. Genital segment about the same 

 size as the carapace, evenly rounded anteriorly, its lateral margins 

 convex, its posterior margin cut obliquely on either side, with small 

 and sharp spines at the posterior corners and a wide and deep median 

 sinus. The margin between the sinus and the corner spine on either 

 side has a double or S-shaped curve, sweeping backward at the side 

 of the sinus and forward close to the spine. 



Abdomen small and plump, a little longer than wide, barrel-shaped, 

 one-jointed, and entirely concealed beneath the genital segment. 

 Anal lamina? short, triangular, and armed with minute and irregular 

 spines. First antennae small and two-jointed, the basal joint heavily, 

 the terminal joint lightly, armed with setse. The basal joint is much 

 wider than the terminal ami twice as long, and its tip reaches well 

 beyond the margin of the frontal plate. Second antennas also small 

 and weak, the terminal claw as long as the rest of the appendage, but 

 slender and not very strongly curved. Adhesion pads much smaller 

 than in Pandarus, the first pair ovate, their long diameter inclined 

 outward and forward at an angle of 45° to the body axis, the second 

 pair much smaller, circular, and at the very base of the second 

 antennjE, on the ventral surface of the carapace, so that they can not 

 be lowered against the fish's skin as in Pandarus. 



Mouth-tube and mandibles of the usual form for this subfamily; 

 second maxillge lamellar, each tipped with a long and narrow spine. 

 In other genera these lamellae are attached along a line at right angles 

 to the body axis, or one inclined outward and backward, so that the 

 appendages when at rest against the surface of the carapace are 

 parallel with the mouth-tube or turn inward and overlap it. But in 

 the present genus the line of attachment is inclined backward and 

 inward, parallel with the tapering margin of the mouth-tube, so that 



