PA RASITIC COPEPODS— CA LIGIDM— WILSON. 663 



is a slender spine at the anterior distal corner of the second joint and 

 the usual armature on the terminal joint, three plumose setae on the 

 posterior margin, three terminal claws, and a spine at the distal corner. 



The second legs are like those of Oaligus and Lepeophtheirus. The 

 rami of the third legs are very close together, but are not at all fused. 

 They project well beyond the edge of the basal apron. The exopod is 

 three-jointed and the endopod two-jointed. All the spines and setae 

 are small except those on the respective basal joints. 



The fourth legs are large. The basal joint is stout, but is consider- 

 ably less than half the entire length. The three terminal joints are 

 about the same length. The second joint ends in a small and strongly 

 curved claw; the third joint is tipped with a longer and straighter 

 claw, while the fourth joint ends in the usual three claws, graded in 

 size from without inwards. 



At the base of each claw is a large lamina tipped with radiating 

 bristles, like those in Lepeophtheirus edwardsi. 



Along the outer margin of the two longest terminal claws, and along 

 both margins of the outer shortest claw, is a wide serrated fringe or 

 lamina, again like that in L. edvxtrdsi. 



The fifth legs are well defined with long setae, but are wholly con- 

 cealed in dorsal view by the dorsal lamina. 



Total length 5.3 mm. Length of carapace 3.5 mm.; width of same 

 3.5 mm.; length of lamina covering free and genital segments 2 mm.; 

 length of egg strings 3.1 mm. Seventy or eighty eggs in each. 



Color a light cinnamon brown, the pigment uniformly distributed 

 and not in spots. 



(palliata, wearing a cloak or mantle.) 



Male. — Carapace more quadrangular than in the female, distinctly 

 wider than long, with the sides somewhat flattened. 



Frontal plates well defined, relatively larger than in the female, 

 the joint which separates them from the carapace almost a straight 

 line. In this sex also the plates are completely separated b}" the deep 

 median incision, in which can be seen the remains of a frontal filament. 

 The posterior sinuses are broadly triangular, leaving a median lobe 

 less than half the entire width. The lateral lobes are broad and well 

 rounded and the} 7 do not curve in at all at their tips. 



Grooves and thoracic area as in the female, except that the digestive 

 glands are very pointed anteriorly and much elongated. 



The tree segment is as wide as the genital segment, but is quite short. 

 It is constricted anteriorly into a neck, where it joins the carapace, and 

 is considerably enlarged through the bases of the fourth legs into a 

 spindle shape. 



There is m> dorsal plate or lamella, as in the female, but the segment 

 is like that in Oaligus and Lepeophtheirus. 



The genital segment is quadrangular in outline, slightly emarginate 



