A NEW GENUS, N&ESICOPEA 863 
should have been so little examined, that their relation- 
ships are left rather to speculative argument than to any 
basis of observed facts. I can, however, myself testify that 
Spheroma rugicauda, Leach, need not have recourse to 
Cymodoce for a male form. In the character of the pleo- 
pods Cymodoce agrees with Spheroma as opposed to Nesa, 
although, as to the stilets of the second pair, in Cymodoce 
truncata they are apically narrowed. 
The species, Cymodoce abyssorum, Beddard, from 1,070 
fathoms, off New Guinea, must be transferred to a new 
genus, for which I propose the name Neesicopea. The last 
seoment of the peraeon is much narrower than the segment 
before or the segment behind it, and has the side-plates 
rudimentary. ‘There are two median dorsal teeth, one 
behind the other, on the pleon. The fourth and fifth 
pleopods have both branches fully branchial. The uropods 
in the male have the inner branch rudimentary, the outer 
greatly prolonged. In the female they are placed higher 
up than in the male, with a longer inner branch, and the 
outer not much longer than the inner. ‘The name refers 
to the combination of characters found in Nesa and in the 
genus next to be mentioned. 
Campecopea, Leach. 1814, has the sixth segment of the 
pereeon produced in the male, but not inthe female. The 
uropods are inserted high up on the terminal segment, 
and have the movable branch, long, curved, and produced 
beyond the apex of the segment; while the inner branch, 
marked off by a partial suture from the peduncle, is a 
mere knob, only distinguishable on the under side. It 
can scarcely be doubted that only one British species of 
this genus is at present known, Campecopea hirsuta (Mon- 
tagu), of which Campecopea Cranchi, Leach, is the female. 
The two forms are constantly found in company in the 
little blackish or dark green sea-weed, Lichina pygmea. 
In colour they entirely agree, as in almost all other par- 
ticulars except the long tooth on the sixth perzeon-segment. 
In some specimens this tooth may be seen in various 
stages of growth, while others are entirely without it. 
All specimens roll themselves up very tightly, so that, in 
