NO. 1404. PARASITIC COPEPOBS—CALiaiB.E— WILSON. 643 



eyes small and situated far forwai'd in the carapace. Free segment 

 short and narrow, (lenital sc^ginent ([uadrilateral, widei- than long, 

 widest and somewhat emarginate })osteriorly, lobes very short and 

 well rounded. 



Abdomen only one-fourth the width of, l>ut slightl}^ longer than, 

 the genital segment, and indistinctly four-jointed. It is C3dindrical in 

 form and tapers somewhat toward the tip; the joints also diminish 

 regularly in length, the basal one being about twice the length of tht» 

 terminal. The anal laminte are large and leaf -shaped, l)ut armed with 

 short seta?. 



The egg strings are two-thirds as long again as the entire body, of 

 medium width, and there are ])etween sixty and seventy eggs in each. 



The first antenna? are short and inconspicuous, with the two joints 

 about the same length; the second antenna? are stout, the basal joint 

 short and wide, and tapering rapidly outward. This joint is provided 

 on its inner surface with a knob-like process of chitin, the surface of 

 which is raised into pai-allel transverse ridges, overlapping one another. 

 There is thus foj-med a tile-like surface which assists materially in the 

 prevention of slipping. The terminal claw of this second antenna 

 has a long slender spine on its outer margin. The mandibles are 

 three-jointed, the third joint curved in toward its fellow and toothed 

 along its inner margin. 



The second maxilhe are triangular and bifurcate for about one-third 

 of their length; the branches are narrow and sharp while the l)asal 

 portion is wide and strong. 



The tirst maxillipeds are very slender, the terminal joint much 

 longer than the basal and armed with a short, sharp spine on the inner 

 margin near the center. The two terminal claws are not as uneven as 

 in many species and both are bordered with a "delicate pectinate 

 membrane" (Gissler). The second maxillipeds are large and stout, 

 the basal joint considerably longer than the terminal claw. The acces- 

 sory spine on the latter is near the ))ase. The fourth swimming legs 

 are short and weak, four-jointed with five spines, the basal joint as 

 long as the other three, which latter are widened toward the tip. 



The spine on the second joint is short and strongly curved, the other 

 four spines are al)out equal and arranged in a row at the tip of the 

 last joint. This is due to the fact that the second spine at the tip of 

 the thii-d joint is carried out b}" the elongation of the joint to a level 

 with those on the terminal joint. 



Total length 9.5 nun. Length of carapace 4.6 mm.; width of same 

 4 mm. ; length of genital segment 2.4 nun. ; length of abdomen 2. 5 nun. ; 

 length of Qigg strings 15 mm. 



Color dark rufous on the dorsal surface, lighter below. 



{pacijicus^ of or belonging to the Pacitic.) 



Twenty-three females of this species were ol)tained by Gissler from 



