NO. 1404. PARASITIC COPEPODS— CALIG ID. E— WILSON. 625 



posterior corner. Abdomen only one-third the length of the genital 

 segment, but two-jointed, the joints unequal, the l)asal one wider and 

 the terminal one longer. Anal laminaj small, nearly linear, furnished 

 with short setse. 



Of the appendages the second antenna are branched as usual in 

 males. The first maxilhe are very long and sickle-shaped. The sec- 

 ond maxillipeds have a stout spine or tooth on the inner margin of the 

 l)asal joint. The other appendages are the same as in the female. 



Total length, 5 nmi. Length of carapace, 2.75 nun. ; width of same, 

 2.5 mm.; length of genital segment, 1.65 mm.; length of abdomen, 

 0.75 mm. 



{nordmamiil^ to Dr. Alexander v. Nordmann.) 



This species was first described by Milne-Edwards in 1840, under 

 the genus Caligus. This error was corrected by Baird in 1S50, and 

 the species was placed under the genus Lepeopldlielt'us^ which had been 

 founded by Nordmann himself in 1832. 



It is apparently confined to the suntish of our own coast and in Euro- 

 pean waters, as all the recorded specimens have been obtained from 

 that fish. And it is not very abundant, only a few specimens being 

 obtained from among the many parasites which infest one of these 

 fishes. The National Museum collection includes three lots, 6018, 

 12667, 12668, the first and last from the vicinity of Woods Hole, the 

 other from Casco Bay. 



LEPEOPHTHEIRUS HIPPOGLOSSI Kroyer. 

 Plate XX, fig. 6 in the text. 



Caligtis hippoglossi. Kruyek, 1837, p. 625, pi. vi, fig. 3 a. and b. — Milne- 

 Edwards, 1840, p. 456. — Ratiike, 1843, p. 102. — Steenstrup and Lutken, 

 1861, p. 355. 



Lepeophtlieirm hippoglossi Baird, 1850, p. 276, pi. xxxii, fig. 12.— Kroyer, 1863, 

 p. 131, pi. VI, fig. 5, a-d.— T. Scott, 1900, p. 151, pi. v, figs. 38-42; pi. vi, 

 figs. 1-2. 



Female. — Carapace elliptical, widest at the center, one-fourth longer 

 than wide. Frontal plates very distinct, but rather narrow. Poste- 

 rior sinuses shallow and widely separated, leaving the median lobe 

 fully half the entire width of the carapace. This lobe has a very flat 

 posterior curve and usually overlaps the free segment. The lateral 

 lobes are short and curved inward strongly at their tips. 



Free segment one-eighth the length of the carapace and four-fifths 

 as wide as the genital segment, the portion to which the fourth legs is 

 attached projecting strongly on either side. 



Genital segment three-fifths the length of the carapace, narrow, 

 elliptical in outline, the length to the width in the proportion of 5 to 

 •1; posterior lobes narrow and pointed. 



