no. 1404. pa ra srrrr cope pods— ca ligidjs— wtlson. 657 



the former slightly enlarged where it joins the ventral surface, the 

 latter of a broad U shape, with blunt points. 



The second maxillipeds are enormous, the stout basal joints filling 

 the whole central portion of the carapace; the terminal claws are 

 nearly as long as the basal joint and are strongly curved near their tip. 

 The accessory spine is small and weak and is attached near the base 

 of the claw. 



There are no spines on the first legs except on the terminal joint, 

 where there are the usual three, and three plumose setas on the poste- 

 rior border. The three spines on the exopod joints of the second legs 

 are the same size and all very sharp. 



The rami of the third legs are close together, with a large spine at 

 the base of the exopod. The fourth legs are long and stout, three- 

 fourths the length of the genital segment. 



The basal joint is nearly as long as the other three, exclusive of the 

 claws. Of the latter there are five, a tiny, rudimentary one at the 

 enlarged tip of the second joint, a somewhat larger one at the tip of 

 the third joint, and three terminal ones. 



These last are graded in size from without inward. The outer one 

 is no larger than that on the second joint, the second one is three 

 times as large, while the inner one is twice the size of the second and 

 is toothed along its outer border. 



The fifth legs are invisible dorsally, but are plainly discernible on 

 the ventral surface. 



Total length 9.2 mm. Length of carapace 2.8 mm.; width of same 

 2.5 mm.; length of genital segment 2.8 mm.; length of abdomen 3.2 

 mm. ; length of egg strings 6 mm. Eighty to eighty-five eggs in each. 



Color a dark steel gray, changing but little in alcohol. 



(irvnominatus, without a name, the one given to it being preoccupied.) 



The National Museum collection has a single lot of this species, 

 numbered 8028, and including three females taken from a salmon at 

 Cornwall, England, by the Rev. A. M. Norman. 



These are labeled by Mr. Norman Lepeophtheirus gracilis, but that 

 name can not stand, for several reasons. In the first place, P. J. van 

 Beneden described, in 1851, a species which he called Caligus gracilis, 

 I nit which was really a Lepeophtheirus. If any species of the genus 

 were to preserve the name gracilis, it would of necessity be this one. 

 But even a casual glance at Beneden's figure will suffice to show that 

 he was really describing something very different from the present 

 species. 



A.gain, Beneden's species has been shown by various authors to be 

 the same as L. thompsoni Baird, and hence must he included under the 

 synonyms of that species. Therefore it could not stand for the 

 present species, an entirely different form. 



