NO. 1805. DESCRIPTIONS OF NEW COPEPODS— WILSON. 629 



of the H is much wider than the anterior and is transversely elHp- 

 tical in forrn, being fully twice as wide as long. A series of grooves 

 connect the anterior portion of the H with the lateral niargin of the 

 carapace on either side, each groove producing a slight indentation 

 where it meets the margin. Another groove extends diagonally in- 

 ward from the tip of the side of the H, the two almost meeting at 

 the midline. This produces a configuration whose nearest approach 

 is seen in Galigus aliuncus and 0, Jisemulonis. 



Free thorax segment about one-fifth the width and one-fourth the 

 length of the carapace, widened through the bases of the fourth legs, 

 and showing there a rudimentary dorsal plate on either side, over the 

 base of the leg. These plates are minute, but evidently correspond 

 to the better developed ones in Alehion and Gloiopotes. 



Genital segment, including the posterior lobes, as long as the cara- 

 pace, but less than half as wide, with nearly straight sides and pro- 

 duced at each posterior corner into a conical process, three-fifths as 

 long as the body of the segment. 



Abdomen flattened cylindrical, five times as long as wide, two- 

 jointed, with the joints about equal; anal laminae large, spatulate, 

 each armed with four nonplumose spines. Egg-cases cylindrical, 

 reaching just beyond the tips of the anal laminae; eggs large, about 

 thirty in each case. 



First and second antennae like those of LepeopJitheirus, each of the 

 second pair with a large spine on the posterior margin of the basal 

 joint. Maxillary hooks long and sickle-shaped, their bases opposite 

 the tips of the second antennae. 



First maxillae large and undivided, each maxilla curved outward a 

 little and reaching well beyond the tip of the mouth tube. 



Furca double, the proximal end of the terminal portion telescoped 

 inside the distal end of the basal portion, the branches strongly 

 curved so as to make the sinus between them a half circle. 



Terminal claw of the maxillipeds slender, strongly curved, and 

 about half the length of the basal joint. 



First legs with a rudimentary endopod attached to the basal seg- 

 ment, cylindrical in form, tliree-jointed, and tipped with tliree spines 

 and a short rounded process. Terminal claws of the exopod dimin- 

 ishing a little in length from without inwards; there is no seta at the 

 distal corner, but the three plumose setae on the posterior margin 

 are of the usual size. 



Second legs like those of LepeopJitheirus; third pair with an enor- 

 mous sickle-shaped claw at the base of the exopod. The groove 

 between the two- joints of this exopod, instead of being transverse as 

 it is in Caligus and LepeopJitheirus, is fully as diagonal as it is in the 

 fourth legs. The endopod overlaps the exopod at its base, but is 

 considerably shorter. 



