Marink Copepoda from Western Australia. 
137 
4-sogTnented, with a large sjonr on tlie second segment and with a sensory 
filament on tlie third segment ; second antenna w'ith 1-sogmented exopod, 
bearing 2 terminal and 1 lateral setae ; moiith parts of usual structure (fig. 3). 
First legs with basal segment of ondopod longer than divStal and without inner 
seta, end segment with 2 long terminal setae, plumose terminally ; seta formula 
for legs 2-4 : 
endopod 
exopod 
P- 2 
0 120 
0 1 022 
P- 3 
0 020 
1 1 022 
P- 4 
0 010 
1 1 022 
Fifth legs like those of linearis but distal segment somewhat wider. C^audal 
rami half as long again as wide, with largo terminal seta, nearly as long as 
urosome, and a few inner spines. Anal operculum with a few coarse spines. 
Male: Length 0*78 mm. Differs from the fenialo in the first antenna, 
endopod of 3rd leg, 5th and Gth legs. First anhaiiia fi-segmented, subchiroce.rate, 
(fig. 3). Endopod of third h^g 3-s(^gment(Ml, bearing a long har})ed spine on 
the second segmtjut, similar to that fouiul in wallim- Lang (1034), aiid a single 
terminal seta on the end segment ; fiffh and sixth logs reduced (fig. 3). The 
seta formula of logs 2 4 is like that of the female. 
This species, of w’hich 2 fiunalt^s and 1 male were found, resembles wallird 
in having only two outer spines on tlio end sc^gments of the exopods of tlu; 
swimming legs, btit differs from that species in lacking an inner seta on the 
basal segment of the first endopod, in the seta formula, anrl iu the shape of 
the fifth legs in the female. The male, witich resembles wnllini in the thii'd 
endopod, differs from it in the fourth (indopod. 
Orthopsyllus similis sp. nov. 
Female : Length 0*95 mm. Body similar to that of the preceding species 
but the fringe of denticles on the hinder margins of the segments is eonfiiKHl 
to the dorsal surface ; rostnn7i well defined and articulatfid with tlie luiad ; 
first antcuma 4-seginout(Hl, with a small spur on tlu; second si'-gmeul ; oxopod 
of the second antouna with two terminal and tw-o latr^ral setai^ ; mouth parts 
as in O. liUoniUs. First log similar to that of the jireceding specii^s }>ut having 
tlie distal sogmimt of the endo 2 >od longer ami moix* sl(md(n" ; distal segments 
of ondopods 2- 4 also longer than in littoralis (ef. ligs. 3 and 4), and seta 
formula for these legs as follows : 
endopod 
exopod 
P. 2 
0 
110 
0 0 013 
P- 3 
0 
no 
0 0 013 
[7. 4 
0 
121 
0 0 013 
Fiftli logs vmy like tlujse of llUoralis ; caudal rami nearly twice as long as wide, 
with a w'ell dovelo^jed inner denticulate ridg(j ; anal o[)orcukun unarmed. 
Male: J^ongth 0-90 mm. Differs from the fiunah^ in t)i(; usual sexual 
cliaractcrs and a fiiw minor points. First antenna G-st^gniontcd, suhrJdroneralc ; 
coxa of first logs with outer f)roj('ction ; endo 2 )ud of S(Mtond leg having the 
distal segment corisi<lerab!y longcu* than in tlie female ; third endopod 3-seg- 
mented, the modified spine on tho middle segment considerably laT-g(!r and 
more strongly modified than in other species, distal segment with an imier 
