NO. 1404. PARASITIC C0PEP0D8—CALIGIDM— WILSON. 599 



the two terminal ones are serrate along- their outer margins. Fifth 

 legs invisil)le. 



Total length (> nun. Length of carapace ^.1 nun.; hreadth of same 

 2 nun.; length of genital segment 1.6 mm.; length of at)domen 2 mm.; 

 length of Q^<^ sti'ings 2.2 mm.; 80 eggs in each. 



j\f((J('. — Carapace ovate like that of the female, but narrowed rather 

 more anteriorly, as long as wide; median lobe relatively w^ider and not 

 projecting l)ackward as far. Free segment shorter and relatively 

 wider. Thoracic area wider than long and evenly rounded in front; 

 lateral lobes narrow and somewhat pointed, ({enital segment narrow- 

 ovate, one-third longer than wide, the sides nearly straight. 



This segment is nnich smaller than in the female, being less than 

 one-third the width of the carapace and not very much wider than the 

 abdomen. The hfth legs can not be seen in a dorsal view, and there 

 are no traces of lobes at the posterior corners. 



The abdomen is elongate-linear, similar to that of the female, and is 

 made up of two distinct joints, which are about equal in length if we 

 leave out of account the anal lamintv. The latter are small, scarcely 

 any larger than in the female, but the seta' with which they are armed 

 are considerably larger and longer than those of the female. 



The appendages are as alread}^ described; there is the usual increase 

 in size of the second antennae and the second maxillipeds. And there 

 is the same absence of plumose seta^ on the posterior border of the 

 terminal joint of the tirst swinuning legs, which may be taken as 

 characteristic of the species. 



The fourth legs are small and hardly reach the ])osterior border of 

 the genital segment. In other particulars the appendages are like 

 those of the female. 



Total length -i.S mm. Length of carapace 2.2 mm. ; breadth of same 

 2.2 mm.; length of genital segment 1.1 mm.; lengtli of abdomen 

 1.1 mm. 



Color a uniform yellowish brown entirely destitute of pigment 

 markings of any sort. 



{product ii.<<^ lengthened or drawn out.) 



There is one lot of this species in the National Museum collection, 

 consisting of four females taken from the common dolphin {C<>r!/j>]nr)i<i 

 Juppuriis)^ from the inner side of the gill covers and the outer surface 

 of the body. The tish was captured by the United States Bureau of 

 Fisheries steamer AlhatroHi^ in latitude 38, lU, 20 West and longitude 

 OS, 20, 20 North. This is the original species described by Dana in 

 18.54 as occurring on the same dolphin and on trigger fishes {Buli^^fcs) 

 in the West Indies. It was afterwards noted by Steenstrup and Liitken 

 (1801) as taken from the inside of the operculum of the ''Barracuda'' 

 {S'p/u/r;t'/)(/), and ])y Kroyer (1S0.3) as found on this same Cort/pJuvna. 



The specimens described by these three authors agree closely in 



