144 LIVERPOOL BIOLOGICAL SOCIETY. 
(fig. 4) long and narrow, with finely serrated edge. The 
fifth feet in the male (fig. 5) are unbranched; the right 
one (fig. 5 a) is two jointed, the second being a large and 
powerful claw usually doubled back upon the first and very 
muscular. The inner edge of the hinged claw is provided 
with about twenty long teeth placed longitudinally, with a 
rounded projection at lower end, the outer edge of the claw 
forming a protection to the row of teeth. The left fifth foot 
of male (fig. 5 6) is long, three jointed, muscular, and ter- 
minated by four strong curved spines. The fifth feet in the 
female (fig. 6) are nearly alike on each side, two branched; 
the outer branch having two short spines on each side and 
trifid at the apex; the inner branch is rudimentary, in 
some specimens being a single pointed spine with broad 
base; in others it is a rounded protuberance. The abdomen 
of the male is four jointed; that of the female two jointed. 
The caudal segments (fig. 7) are two jointed in both 
sexes; in the female the two terminal segments are 
different, that of the right side being somewhat larger 
than the left and rounded on the inner side; each side is 
terminated by five strong plumose sete. 
This species, easily distinguished by the fifth feet in the 
male and the caudal segments in the female, occurs 
plentifully in several of the tow-net gatherings from Malta. 
For some time I believed that the specimens represented 
a new species, and for confirmation, I sent specimens to , 
both Sir John Lubbock and Dr. G. 8S. Brady, F.R.8., who 
were unable to refer it to any known species. Consequently 
the above description and the accompanying figures were 
prepared ; but fortunately, while they were still in proof, 
I discovered that Claus’s Pontellina mediterranea (figs. 11 
and 12, Taf. xxxvi., ‘‘Die frei lebenden Copepoden der 
fauna Deutschlands, der Nordsee und des Mittelmeeres’’), 
male specimens of which he found at Messina, undoubtedly 
