PARASITK ' C0PEP0D8—CALIGIDM- WILSON. 563 



Furca much narrower than in the female, branches close together 

 and nearly parallel, destroying the hourglass outline. 



Third legs larger than in the female, attached nearer the posterior 

 border of the carapace, and projecting laterally to the edge of the 

 carapace, and posteriorly to the center of the genital segment. The 

 basal joint of each is fully as large as the genital segment, and being 

 transparent the longitudinal libers of the muscles show through plainly 

 and give the central portion a striated appearance. The fourth legs 

 are relatively much longer than those of the female. 



Total length, female 3.63 mm.; male 3 mm. Length of carapace, 

 female 2 mm.; male 1.9 mm. Length of genital segment, female 0.84 

 mm.; male 0.5 mm. Length of abdomen, female 0.65 mm.; male 0.6 

 mm. Length of egg strings 1.9 mm. 



( 'halimus. — Carapace considerably more than half the entire length, 

 ovate, strongly narrowed anteriorly. Frontal plates large and well 

 defined. Posterior sinuses narrow and nearly parallel, the median lobe 

 proportionally a little wider and more squarely truncated posteriorly 

 than in the adult (tig. 53). 



First antennae large, prominent, and well armed with plumose setae 

 and spines. Free segment very short, but as wide as the genital seg- 

 ment. The latter is barrel-shaped, one-quarter wider than long with 

 evenlj 7 rounded sides and squarely truncated anterior and posterior 

 borders. 



The two abdomen segments are about the same relative size as in the 

 adult, but compared with the genital segment they are much wider, in 

 fact almost as wide as the genital segment itself. 



The anal laminae are smaller than in the adult and their plumose 

 setae are shorter. The appendages appear about the same with the 

 exception that the second, as well as the third swimming legs show 

 posterior to the carapace in dorsal view. Total length 1.75 mm. 

 Length of carapace 1 mm.; width of the same 0.8 mm. Length of 

 genital .segment 0.3 mm. Length of abdomen 0.4 mm. 



( !olor, pale straw yellow, covered on both the dorsal and ventral sur- 

 faces with scattered spots of a rusty brown pigment. In some speci- 

 mens these spots ure few in number and not noticeable, but in the great 

 majority of instances they are quite numerous and at once catch the 

 eye. particularly on the dorsal surface of tin 1 genital segment. 



(riifus. rust color; maculatus, spotted.) 



Specimens belonging to this species were obtained by the author 

 from Fundulus majalis and /\ heteroclitus. 



They are more often found upon tin 1 former but are not at all com- 

 mon. a careful examination of five hundred of these minnows yielding 

 barely half a do/en specimens. The National Museum collection also 

 includes three specimens taken by Yinal X. Edwards, one from a mul- 

 let {Mugil cephakts), and the other two from the. surface at the Fish 



