PHYLLOPODA OF W. AUSTRALIA. 303 
from the Western State is probably due to the small number of 
collections that have been made. 
Lynceus tatei (Brady). 
Several specimens were collected in pools at Busselton, South- 
West Australia. They agree in almost all respects with the 
description by Sars and the figures by Brady. 
There is a slight difference in the shape of the rostrum, but 
this is so small that it seems hardly sound to make a new variety 
out of the specimens at my disposal. The collection included 
both males and females. The size was much smaller than the 
figure given by Sayce. Specimens varied between 2°5 mm. and 
3°79 mm. 
Lynceus tatei is now known from Victoria, New South Wales, 
South Australia, and Western Australia. 
Family TRiopsi1p#(A PODID!). 
Genera Apus and LeprpuRus. 
The family Triopside contains but two genera, Apus (7’riops) 
and Lepidurus. Both genera occur in Australia, and as a result 
of the Hamburg Expedition both were recorded from Western 
Australia. Apus itself has been recorded previously from 
Western Australia. Both genera appear to be pretty common in 
pools scattered about the State, and although specimens have 
only been obtained from one or two places, there is evidence that 
their occurrence is by no means restricted to these spots. 
Genus LEPIDURUS. 
Wolf, in his paper on the Phyllopoda of the Hamburg 
Expedition, remarks on the great difficulty in diagnosing species 
of this genus. The number of the segments which bear no 
appendages varies in one and the same species, and in no form is 
the number eight exceeded. Large numbers of specimens are 
required before one can feel certain of any systematic work. The 
result is that five species recorded from Australia are considered 
to be all identical—the species being then Lepidurus viridis 
Baird. Wolf found, however, that there were some essential 
differences in the specimens from different localities, which he 
had received for examination, and as a consequence divided his 
examples into two new varieties. These are Lepidurus viridis 
Baird, var. elongatus Wolf, and Lepidurus viridis Baird, var. 
setosus Wolf. 
I have met with specimens which are evidently Lepidurus 
viridis var. elongatus, and from quite a new locality, namely 
Northam. 
