obtained during the Cruise of the * Oceana.’ 25 
is 25-jointed, that of the left 22. The comparative lengths 
of the joints of the latter are about as follows :— 
1234567 89 10 11 12 13 14 15 16 17 18 19 20 21 22 
WII SO Ses Soule 18) 6) Gllskensl en a 
The geniculation in the left antenna is between theseventeenth 
and eighteenth joints. Fifth pair of swimming-feet (fig. 4) 
each a single branch with four joints, the terminal joints 
being long, stout, blunt spines, with a minute spine at the 
end of each. 
Much less perceptibly than in MW. venusta, the right caudal 
segment is shorter than the left. 
Giesbrecht’s previous records of this species are the 
Pacific Ocean and the Gulf of Gascogne, so its range also is 
much extended. 
Pleuromamma abdominalis, Lubbock. 
1856. Diaptomus (part.), Lubbock, Tr. Ent. Soe. vol. iv. p. 22. 
Very common throughout the collection, occurring at 
twenty-seven stations at depths from 270 to 1770 fathoms. 
Easily recognized by its round lateral black pigment knob. 
Pleuromamma gracilis, Claus. 
1863. Pleuromma gracile, Claus, Freileb. Cop. p. 197. 
A rare species, though widely distributed throughout the 
world. One specimen only was found, at a depth of 1570 
fathoms. 
Lucicutia longicornis, Giesbrecht. 
1889. Leuckartia longicornis, Giesbrecht, Atti Acc. Lincei Rend. ser. 4, 
vol. v. p. 812. 
One specimen was found at a depth of 1070 fathoms. 
The only previous record of this species is the Pacific Ocean. 
Lucicutia flavicornis, Claus. 
1863. Leuckartia flavicornis, Claus, Freileb. Cop. p. 186. 
A widely distributed ocean species. Occurred at ten 
stations at depths from 810 to 1770 fathoms, 
Lucicutia longiserrata, Giesbrecht. 
1889. Leuckartia longiserrata, Giesbrecht, Atti Acc. Lincei Rend. 
ser. 4, vol. v. p. 818. 
One specimen was obtained at 1275 fathoms. Its only 
record hitherto is the Pacific Ocean. 
