Rev. A. M. Norman on Crustacea Cumacea. 
69 
blance to Leucon ; but in that genus three pairs of pereiopods 
are furnished with a palp, and the male has only two pairs 
of swimming-feet on the pleon. 
Iphinoe serrata , Norman. 
1866. Iphithoe serrata, Norman, Report of Committee for exploring 
Coasts of the Hebrides, Brit. Assoc. Report, 1866 (1867), p. 201. 
1868. Iphinoe serrata, Norman, Brit. Assoc. Report, 1868 (1869), 
p. 272. 
1 Porcupine,’ 1869, Station 20, lat. 55° IP N., long. 12° 46' 
W., 1443 fathoms. 
Genus Leucon, Kroyer (1846). 
1. Leucon longirostris , G. O. Sars. 
1871. Leucon longirostris, G. O. Sars, Beskr. af Fregatten Josephines 
Exped. Cumaceer, Kongl. Vet.-Akad. Handl. vol. ix. p. 42, pi. xv. 
fig. 75. 
The type of this species was procured in 550 fathoms off 
the coast of Portugal during the ‘ Josephine ’ expedition. It 
was only a fragment, part of the pleon being broken off. 
A single specimen dredged in the ‘Valorous’ expedition, 
at the entrance of Davis Strait, lat. 59° 10' N., long. 50° 25' 
W., in 1750 fathoms, agrees very closely with Sars’s beautiful 
figure. 
I add a few notes, chiefly on that portion of the animal 
which was absent in the type specimen. The specimen 
examined by me is a female; that observed by Sars was a 
male. 
Number of dorsal spines of carapace seven, of the under¬ 
side of the rostrum four, of the antero-lateral margin nine; 
and there are two small spines close together on the front 
margin between the antero-lateral corner and the base of the 
rostrum. 
The first legs are very long and remarkably free from 
seta3; the thigh is armed with two spines. 
On the belly between the last pair of legs is a thorn-formed 
spine with the point curving forward. 
Pleon having the first five segments gradually increasing 
in length, but the fifth twice as long as the sixth; telson very 
short. 
Uropods broad and flattened ; peduncle with two spines on 
the inner margin ; inner branch with eleven spines on the 
inner margin (nine on 1st joint, two on 2nd), and terminating 
in a long spine; the second joint not one third the length of 
the first; outer branch as long as the first joint of the inner 
