66 BEITISH PARASITIC COPEPODA. 



2. Lepeophtheirus nordmanni (M. Edwards). 

 (Plate XII, fig. 1 ; Plate XVI, figs. 4-11.) 



1840. Caligus nordmanni M. Edwards. (43) p. 455. 



1847. Caligus nordmanni W. Thompson. (129) p. 248. 



1850. Lepeophtheirus nordmanni Baird. (4) p. 275, pi. xxxiii, fig. 1. 



1865. Lepeophtheirus nordmanni Heller. (58) p. 180, pi. xvi, figs. 1, 2. 



1884. Lepeophtheirus nordmanni Rathbnn. (97a) Proc. U. S. National 

 Mns., vol. vii, p. 487. 



1900. Lepeophtheirus nordmanni T. Scott. (112) p. 151, pi. v, figs. 

 32-37. 



1905. Lepeophtheirus nordmanni C. B. Wilson. (145) p. 623, pi. xix. 

 figs. 223-233. 



1909. Lepeophtheirus nordmanni E. Y. Elwes. (45) p. 19. 



Female. — Carapace suborbicular, about as long as 

 broad and equal to about half the entire length of the 

 animal. Frontal plates narrow, without lunulas. Free 

 thoracic segment small, somewhat rhomboid in shape. 

 Genital segment obovate, considerably narrower than 

 the carapace, and equal to fully one-fourth of the entire 

 length of the animal ; length and width about equal, 

 and with the postero-lateral corners forming rounded 

 lobes so that the space between is deeply incurvated. 

 Abdomen short, consisting of a single segment with a 

 slight constriction near the middle. Caudal rami short. 

 Antennules of moderate size. Antennas armed 

 with tolerably long and strongly-hooked terminal 

 claws. Mandibles slender and elongated, end joint 

 comparatively short and finely serrated on the inner 

 margin. Second maxillipeds moderately stout and 

 elongated, and provided with strongly-hooked terminal 

 claws. Sternal fork with the basal portion narrow, 

 the rami also comparatively narrow and elongated, 

 and somewhat divergent. Fourth pair of thoracic 

 legs tolerably elongated, basal joint not very stout and 

 rather shorter than the ramus, which consists of three 

 subequal joints ; the first and second joints of the 

 ramus each provided with a short spine on the outer 

 distal angle, the end joint with three moderately long 

 apical spines, the outermost being scarcely so long as 

 the other two. Length about 12 mm. Egg-strings 

 considerably elongated. 



