PARASITIC COPEPODA. 193 



is two-jointed and is actually longer and wider than the mouth -tulre. Upon the 

 basal joint, which is fused to the carapace, appears the rudimentary exopod in the 

 form of a small papilla bearing two setae. It is situated near the centre of the basal 

 joint and close to the endopod. The endopod itself is simple as in the genus Caligus, 

 and not bifurcate as in many species of Lepeophtheirus (fig. 13). 



The first maxillipeds are of the usual pattern, but the outer terminal claw is 

 lengthened so that the two cross each other from opposite sides of the body when the 

 appendages are at rest. The second maxillipeds are small and weak, the terminal 

 claw only half the length of the basal joint, and slender (fig. 14). No trace of any 

 furca could be found. 



The first swimming legs are small and weak ; the three terminal claws are of 

 nearly the same length, as is also the seta at the inner corner. The basal joint of the 

 second legs is exceptionally narrow, being but little wider than the connecting piece 

 across the centre of the body ; the rami are of the usual pattern. The rami of the 

 third legs are so close together as to be in actual contact at their bases, but the 

 exopod stands out at right angles to the basal apron, while the endopod is closely 

 appressed to the margin of the latter. The exopod is three-jointed, the joints of 

 about the same size ; this gives it considerable length, which, together with its 

 position, makes it unusually prominent. The basal joint also bears on its inner 

 margin a wide circular lamina, which extends outward to the tip of the terminal 

 joint and inward to overlap the endopod; this latter is of the usual form (figs. 15 

 to 18). 



The fourth legs are also exceptional in having a stout and swollen basal joint 

 and three small and weak terminal joints. The second joint also, instead of being 

 cut off diagonally at the distal end as in other species, is cut squarely across. 



The second and third joints each carry a single spine at the outer distal corner, 

 while the last joint is terminated by a row of three spines ; the five are approximately 

 of the same size. 



No fifth legs are visible, but the genital segment bears upon its margin at each 

 posterior corner three small spines which probably represent the rudiments of 

 these legs. 



The oviducts are not much coiled in the genital segment ; the cement glands are 

 narrow and nearly straight, situated on either side of the mid-line and close to it. 

 In the specimen observed the spermatophores were long and narrow, and turned 

 forward along the ventral surface of the genital segment. Each was curved away 

 from its fellow like a pair of parentheses marks ; the anterior ends almost touched 

 each other, but the posterior ends, entering the vulvse, were about the diameter 

 of the abdomen apart (fig. 19). 



Colour of the preserved specimen a uniform yellowish white, without pigment spots 

 or lines. 



Total length 575 millims., length of carapace 2 '4 millims., width of same 



2 c 



