10 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
Frontal organ: 2-jointed with minute spines or hairs at tip. 
Upper lip: Small, helmet shaped. Irregular protuberances occur 
between upper lip and frontal organ. 
Comparisons.—Other species of Huphilomedes having a furca with 
more than one secondary claw placed between two distally located 
primary claws and a third primary claw are Euphilomedes multi- 
chelata (Kornicker) (1959, p. 230), Huphilomedes oblonga (Juday) 
(1907, p. 145), Huphilomedes polae (Graf) (1931, p. 37). 
Hach fureal lamella of EH. arostrata has four primary claws, but 
each lamella of both E. multichelata and E. oblonga has five. Polygons 
forming the shells of £. arostrata do not have the shingle-like texture 
of shells of E. multichelata and E. oblonga. The seventh limbs of the 
male of L. arostrata have three proximal bristles compared to only 
one on #. multichelata and E. oblonga. 
Euphilomedes polae is closely related to E. arostrata. The two 
bristles on the second joint of the endopodite of the male of E. arostrata 
are longer and are located more proximally on the joint than the 
bristles on E. polae; the third joint of the endopodite of E. arostrata 
has one bristle at the distal end, whereas E. polae has two. 
Graf designated two specimens, both females, captured in plankton 
of the Red Sea, as Philomedes species. Only the furca was described 
and illustrated. ‘The distribution of primary and secondary claws on 
that appendage suggests close relationship with E. arostrata, but lack 
of knowledge of other appendages prevents further comparison. 
Specimens of Huphilomedes polae and Philomedes species were found 
in the same sample, so it is possible that Philomedes species is the 
female of E. polae. 
The second exopodite joint of the sixth limb of E. arostrata differs 
from species of Huphilomedes, Philomedes, Scleroconcha, and Para- 
philomedes in which that appendage has been described in not being 
produced posteriorly. Sixth limbs of species of Huphilomedes having 
a distribution of furcal claws similar to 2. arostrata have not been 
described. 
