EOT1NOSOMA. 11 



2. ECTINOSOMA MELANICEPS, Boeck. PI. XL, figs. 17 



20. 



Ectinosoma melaniceps, Boeck. Oversigt Norges Copepoder, p. 30 



(1864). 



Anterior antennae 6-jointed (fig. 17), slender, gradu- 

 ally tapering, the first two joints short and rather 

 stouter than the rest ; third joint about twice as long 

 as the fourth or fifth, last joint very small. Second 

 foot-jaw (fig. 18) slender; the long middle joint finely 

 setose on both margins, last joint having three slender 

 apical spines. Swimming feet (fig. 19) much as in the 

 preceding species, but having the setae and spinous 

 armature much more slender and delicate. Basal 

 joint of the fifth foot (fig. 20) short and broad, its 

 inner margin devoid of setae and reaching only about 

 half the length of the outer segment, bearing two 

 apical setae, one of which is very short and stout; 

 outer margin produced and having a small apical hair ; 

 second segment broad and short, 4-cleft at the 

 extremity, each digit bearing a single seta, all of 

 different lengths. Tail-segments very short. Length 

 -g^th of an inch (*84 mm.). 



This species does not differ very much from the 

 foregoing. It is, however, much smaller and more 

 delicate in structure, and is moreover always distin- 

 guishable by a a cloudy blackish patch on the head. 

 Its habitat is chiefly amongst weeds or mud, whilst 

 E. spinipes haunts, as has been already stated, sandy 

 or gravelly ground. I have found E. melaniceps 



