Marine Copepoda from Western Australia. 
135 
12.— MARINE COPEPODA FROM WESTERN 
AUSTRALIA. 
I. LITTORAL HARPACTTCOIDS FROM ROTTNEST ISLAND. 
T3y a. G. Nicholes, Ph.D., University of Western Australia. 
Read 8tli April, 1941 ; Published 20th May, 1942, 
The species dealt with in the following pages wore collected from weed, 
attached to rocks on tho shore at liathurst Point, Rottnest Island. This 
island is a coastal limestone formation (actually a calcareous sandstone) 
lying some 12 miles west of Fnunantle, with its long axis running ajiproxi- 
mately east and west. A description of tho island is given by Glauert (1929), 
Bathurst Point lies at the nortli-east point of the island (Lighthouse Point 
in Glauert’s map). The material was collected during April, 1939. 
Fam. PELTIDIIDAE. 
Parapeltidium cristatum. 
P. cristatum Nicholls, 1941, p. 399, fig. 9. 
One specimen, an adult male, was taken and has been described in a 
recent paper dealing mth copepods from South Australia. 
lam. THALESTRIDAE. 
Eudactylopus australis. 
F. australis Nicholls, 1941, p. 410, fig. 15. 
This species, of which the female has already been described, is amongst 
those which are common to the coasts of South and Western Australia. Two 
specimens woyg taken here, one of each sex. The female (length, 1*68 mm.) 
shows a few minor points of dilloronce in tlie second antenna, first and fifth 
legs. The basal segment of the exopod of tho second antenna bears only 
one seta whereas there wore two in tho specimens from South Australia. In 
the tirst leg the endopod is somowliat more robust and relatively shorter, when 
compared with the exopodf than in ttio original material. Tho fifth leg bears 
an extra seta on the distal segment (fig. 1). 
Male : Length, 1*35 mm. Differs from tho female in the usual features 
and in the first leg which is rather more slender than in the female, resembling 
that of the female desciibed from South Austi'alia. The first antenna is 9- 
segmented, with a long sensory filament attached to the 4th segment ; there 
is the usual hinge between the 5tli an<i 6th segments. The other head ap- 
pendages resemble those of the female. The seta formula for legs 2-4 agrees 
with that of the female, except for the modified endopod of the second leg 
(fig. 1). The segments of the fifth leg are partially fused, the basal segment 
bearing three unequal spines and the distal segment one large spine, four small 
sjiines, and two setae (fig, 1). 
Phyllothalestris lata sp. nov. 
This species, of which only one female lias been found, was at first 
(Nicholls, 1941, p. 411) identified as P, nit/sis (Claus). There can, however, 
be little doubt that it is distinct owing to tho greatly enlarged genital seg- 
ment, described for no other si^ocios of this genus. 
