NO. 1573. PARASITIC COPEPODS— WILSON. . 385 



the first antennae and outside the second antenna. They are arranged 

 on either side one behind the other, the posterior one being three or 

 four times as large as the anterior and both being oUiptical in shape. 

 The third pair are nearly circular and lie on either side of the mouth 

 tube at about its center; the fourth or posterior pair are formed on 

 the edges of the lateral plates of the second thorax segment. They 

 are elongated, irregular in outline, and inclined toward the central 

 axis. 



Of the appendages the first antennae are very small and two-jointed, 

 the joints not very well supplied with setae; the second antennae are 

 large, three-jointed, and terminate in the usual claw, which has a 

 double curve like the letter S. The mouth tube is very slender and 

 pointed, and is fully twice the length of the second maxillfS". The 

 latter consist of a thick conical basal joint terminating in a spherical 

 knob, from which extend the two slender, cylindrical terminal joints, 

 which are inclined outward at an angle of about 45°. The mandibles 

 are slender, the two joints about the same length, and they end in a 

 terminal claw strongly curved toward its tip and fidly as long as the 

 joints. On the outer margin of the terminal joint, near the base of 

 this claw, is a shorter accessory claw, and between the two claws the 

 usual tuft of long cilia; both these claws are also densely covered with 

 short hairs. 



The second maxillipeds are massive and nodose, exactly like those 

 in Pandarus, and different from what we have seen mferox and fro- 

 duda. The swimming legs are all biramose, the rami of the first pair 

 two-jointed, of the second and third pairs three-jointed, of the fourth 

 pair two-lobed and foliaceous. 



There is a row of three large adhesion pads along the inner margin 

 of each of the first legs, two of the pads being on the basal joint and 

 the other on the first joint of the endopod. 



The arrangement of the spines and setae on the swimming legs is as 

 follows: First exopod, 1, 0; 2, III: endopod, 0,0; 0, III: second exo- 

 pod, 1, I; 1,1; 3, V: endopod, 0, I; 0, II; 0, VI: third exopod, 1,1; 

 1, I; 4, III: endopod, 0, 0; 1, II; 0, IV. Both rami of the fourth 

 legs have smooth edges without spines or setae. 



The sixth legs are well developed and are situated close to the mid- 

 line just in front of the base of the abdomen, on the ventral surface of 

 the genital segment. Each consists of a two-lobed foliaceous lamina, 

 similar to those of the fourth legs, but considerably smaller. 



Total length, 15 mm.; length of carapace on mid-line, 4 mm.; 

 width of same, 7.9 mm.; length of genital segment, 7 mm.; width of 

 same, 4.65 mm.; length of egg-strings, 30 mm. 



Color a yellowish green, considerably darker in the thicker parts of 

 the body, the dorsal plates and thin margins a clear yellow. 



(latifolia, latus, wide, Sind folia, plates or wings.) 

 Proc. N. M. vol. sxxiii-.07 25 



