42 BRITISH COPEPODA. 



3-jointed, bearing a few short marginal setae, and at 

 the apex of the third joint four long rigid setae and a 

 large falciform claw, which is denticulated on its 

 inner margin, and equal to half the length of the 

 antenna. The mandible (fig. 4 a) is small, pyriform, 

 dilated at the base, and produced into a long stilet- 

 shaped extremity, which is ciliated on both margins ; 

 the maxilla (fig. 4 &) forms a short digitiform process 

 attached near the base of the mandible, and bearing 

 four slender apical setae. Basal joint of the anterior 

 foot-jaw (fig. 5) large and stout, bearing a single 

 curved and ciliated seta (fig. 5 a) at the distal extre- 

 mity ; terminal joint (b) produced laterally into a 

 slender apical seta, and pectinated at the base with 

 fine teeth, which become gradually finer and more hair- 

 like towards the apex. Posterior foot-jaws 2-jointed, 

 the last joint in the female (fig. 6) short and broad, 

 bearing a short, robust, curved spine at the apex, and 

 on the margin two or three more slender spines ; in 

 the male (fig. 7) the second joint is elongated, oval, 

 bearing a fringe of hairs and a single stout curved 

 spine on the inner margin, and at the apex an ex- 

 tremely long falciform claw, the apex of which reaches 

 as far as the middle of the basal joint. The joints of 

 the inner branches of the swimming-feet are, in the first 

 three pairs, produced into short spines at the external 

 angles ; the marginal spines of the outer branches are, 

 as in other species of Liclwmolgus, lancet-shaped, the 

 central axis being bordered by an almost pellucid 

 membranous margin ; the fourth pair (fig. 9) has the 

 outer branch much elongated, the spines and setae 



