ECTINOSOMA. 11 
2. HOTINOSOMA MELANICEPS, Boeck. Pl. XL, figs. 17— 
20. 
Ectinosoma melaniceps, Boeck. Oversigt Norges Copepoder, p. 30 
(1864), 
Anterior antenne 6-jointed (fig. 17), slender, gradu- 
ally tapering, the first two joimts 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 sete and spinous 
armature much more slender and delicate. Basal 
joint of the fifth foot (fig. 20) short and broad, its 
inner margin devoid of sete and reaching only about 
half the length of the outer segment, bearing two 
apical sete, 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 
goth 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 
EH. spinipes haunts, as has been already stated, sandy 
or gravelly ground. I have found H. melaniceps 
