NO. 2063. NORTH AMERICAN PARASTTW C0PEP0D8— WILSON. 695 



45° with the trunk axis; eggs arranged in 7 or 8 longitudinal rows, 

 about 50 in each string. 



First antennae imperfectly three-jointed, projecting far in front of 

 the second pah-, relatively very large, and with a wicked armature. 

 At the tip are four stout ventral spines and two dorsal ones, the lat- 

 ter as long as the antennae themselves and usually surrounded by a 

 wide membranous flange; the second joint also carries a pair of stout 

 spines on its dorsal surface. This armature is totally different from 

 anything found in the entire family and must be quite effective for 

 piercing the skin of the host. Second antennae biramose, the ter- 

 minal joints turned squarely across the frontal margin at right angles 

 to the basal joint, the exopod (ventral) smaller than the endopod 

 (dorsal), each bluntly rounded and armed with a single short and 

 stout spine. Mandible long and slender, with a narrow neck, the 

 tip enlarged and armed with eight well-rounded teeth. Fii'st max- 

 illae tipped with three stout spines, the outer of which is sometimes 

 sm-rounded with a membranous flange; palp armed with a single 

 spine. Second maxillae short and stout, laminate, not tapering, 

 united only at the tips, and fui-nished there with a long and rather 

 slender club-shaped bulla, the pedicel of which is enlarged and forked 

 at the apex, where it incloses a small and solid sphere. Maxillipeds 

 with a stout basal joint and a long and slender terminal claw, with 

 no accessory armature. 



Color, trunk transparent cartilage color; oviducts and eggs white; 

 cephalothorax usually black or blackish from the contents of the 

 digestive tube. 



Cephalothorax and second maxillae, 1.50 mm. long, 0.15 mm. 

 wide. Trunk, 0.50 mm. long, 0.85 mm. wide. Egg strings, 0.60 mm. 

 long, 0.35 mm. wide. 



Specific cJiaracters of male.—Bodj completely folded upon itself 

 and so thoroughly fused that there are no traces of parts or 

 segmentation; egg-shaped, with the head at the pointed end, and 

 ^the appendages and genital process on one side of the egg; head 

 covered with a dorsal carapace, which extends back of the second 

 maxillae. Fu-st antennae three-jointed, tipped with stout setae; 

 second antennae similar to those of the female, but not bent, the 

 exopod larger than the endopod, both rami unsegmented and tipped 

 with two smaU spines; mandibles and fii'st maxillae like those of the 

 female; second maxillae long, with a slender second joint and rather 

 a weak terminal claw; maxillipeds with a large and stout basal joint 

 and a slender terminal claw, armed with a row of minute teeth along 

 its inner margin. 



Color, a uniform yellowish-white. 



Total length, 0.25 mm. Greatest width, 0.125 mm. 



(s'pinosus, covered with spines, alluding to the first antennae.) 



