NO. 1404. PARASITIC COPEPODS—CALIGID.^— WILSON. 641 



with short aiul hhint hraiichos, which are somewhat diverocnt. The 

 first swimiiiiiiii" U\os are short and stout; the basal joint has a short 

 spine at its distal posterior corner, whiki the second joint has a similar 

 one at the distal anterior corner. The terminal claws are nearly the 

 same length, and the plumose setie on the posterior margin are nncom- 

 monl}" large. Second and third legs as usual. The fourth legs are 

 four-jointed, with four spines; the second joint has an enlarged tip, 

 with rough papillar}- elevations, but without a spine. The third joint 

 has a short spine, about as long as the two outer ones on the terminal 

 joint. The fourth or inner terminal spine is fully twice as long as the 

 others. The fifth legs are broadly triangular and terminated by three 

 small spines, but are not visible from the dorsal surface. 



Total length 18.2 mm. Length of carapace 6.0 mm. ; '\vidth of same 

 6.6 mm.; length of genital segment 6.6 nmi. ; length of abdomen 5 

 mm.; length of egg strings 53 nun. ; total length including ogg strings 

 65 mm. 



Color a dirty yellow brown, the dorsal surface often having a 

 strongl}^ metallic luster, cpiite different from any other species of this 

 genus. 



{salmonis^ pertaining to the salmon.) 



Male. — Carapace elliptical, one-third longer than the rest of the 

 bod}", and one-fifth longer than wide. Frontal plates distinct, ))ut not 

 very wide; carapace areas as in the female. 



Posterior sinuses much broader than in the female, l)ut shallow and 

 leaving the median lobe projecting well beyond the lateral lobes. 

 Free segment long and narrow, only five-sevenths as wide as the gen- 

 ital segment, and swollen at the center through the bases of the fourth 

 legs. 



Genital segment elliptical-oblong, slightly narrowed anteriorly and 

 with a shallow emargination on the posterior border, leaving very 

 short and ))lunt lobes on either side. 



Abdomen oblong, a little wider posteriorly, made up of two seg- 

 ments the basal of which is only about one-third as long as the termi- 

 nal. Anal lamina^ very large, more than two-thirds as long as the 

 terminal joint and broadl}' foliaceous, each carrying four long plumose 

 setffi. 



There is the usual sexual difference in the appendages, but nothing 

 worthy of special note save that the fifth legs are not visible any 

 more than in the female. 



Total length 6 mm. Length of carapace 3.45 mm.; width of same 

 2.9 nun.; length of genital segment 1.1 mm.; length of abdomen 

 1.25 nun. 



This species was first described by Kroyer in 1S3S under the genus 

 CaliguK., and again in 1863 as a Lepeophihetrus, adopting Nordmann\s 



