412 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



LEPEOPHTHEIRUS HIPPOGLOSSI (Kr0yer) 



Figure 259 



C aligns hippoglossl Kr0yeb, Naturh. Titlsskrift, vol. 1, p. 625, pi. 6, fig. 3, 1837. 

 Lepeophtheirus hippoglossi Wilson, Proc. U. S. Nat. Mus., vol. 28, p. 625, pi. 

 20, 1905. 



Occurrence. — Found on the outside surface of halibut caught off 

 Nantucket. 



Distribution. — Greenland (Kr0yer, Stephensen) ; Iceland (Han- 

 sen) ; British seas (Baird, Thompson, T. Scott) ; Irish Sea 

 (Schmidt) ; Belgian coast (Beneden) ; Woods Hole (Rathbun, Wil- 

 son). 



Color. — Body a light yellow with spots of pink or red scattered 

 irregularly over the dorsal surface and on the basal segments of the 

 fourth legs ; eye red. 



Female. — Carapace longer than wide, more than half the entire 

 length; fourth segment four-fifths as wide as genital segment, 



strongly narrowed in front of fourth 

 legs; genital segment half the width 

 of carapace, with narrow posterior 

 lobes but no leg rudiments. Abdomen 

 1-segmented, one-fourth the length 

 and width of the genital segment; 

 caudal rami short and wide. Branches 

 of the furca bipartite, the rami 

 strongly flattened and squarely trun- 

 cated; fourth legs 4-segmented, with 

 four spines. Total length, 10-12 mm. 

 Male. — Carapace as wide as long, 

 twice as long as the rest of the body ; 

 fourth segment wider than the genital 

 segment; the latter the same length 

 and width, with two pairs of leg rudi- 

 ments at its posterior corners. xA.bdo- 

 men quadrangular, 1-segmented ; fourth legs reaching beyond the tips 

 of the caudal rami; furca bipartite as in the female. Total length, 

 7-7.5 mm. 



Remarks. — -This is the only American species in which the branches 

 of the furca are bipartite. Though it is chiefly confined to the halibut, 

 as its name implies, it is occasionally found upon rays and sharks. 



LEPEOPHTHEIRUS EDWARDSI Wilson f 



FiGUEE 260 



Lepeophtheirus edwardsi Wilson, Proc. U. S. Nat. Mus., vol. 28, p. 627, pi. 21, 1905. 

 Occurrence. — Found upon the outside surface of the summer 

 flounder, 4-spotted flounder, horse crevalle, garfish, summer skate, 

 and goosefish at Woods Hole. 



Figure 



259. — Lepeophtheirus Mppo- 

 glossi: a. Female, dorsal ; h, female, 

 fourth leg 



