298 PROF. W. J. DAKIN ON THE 
BRANCHINELLA NORTHAMENSIS, sp. n. (PI. I. figs. 6-8.) 
Description of female.—No males of this species have been 
discovered. The female is an undoubted Branchinella. In general 
appearance and size the specimens resemble the females of 
Branchinella longirostris, and are much smaller and more delicate 
than Branchinella australiensis. The living animal is colourless 
and semi-transparent. Eyes very prominent. The head and 
limb-bearing region of the trunk are together much longer than 
the limbless posterior region (termed the tail by Sayce). 
Ist antenne filiform and about 14 times the length of the 
second antennee (see fig. 8). 
2nd antenne more or less ribbon-like but not flattened very 
much. They decrease but little in width until they terminate in 
a rounded end with a sharp point which is situated abruptly at 
the apex. 
The ovisac (fig. 7) is very slender, without lateral expansions 
proximally, and extends posteriorly to the middle of the 4th 
limbless segment (tail- segment). It possesses the characteristic 
ridge on the ventral surface. 
The caudal rami are well developed, provided with strong sete 
and equal in length to the last four segments of the body 
(fig. 6). Length 13mm. 
This species is distinct from Branchinella australiensis in 
(1) General character, size, and shape. 
(2) Form of appendages. 
(3) Antenne. 
It is distinct from Branchinella eyrensis by 
(1) Frontal appendage. 
(2) Size and general form. 
(3) Ovisac. 
It is distinct from Branchinella longirostris by 
(1) 2nd antenne. 
(2) Ovisac. 
BRANCHINELLA EYRENSIS (Sayce). 
This species was recorded by the Hamburg Expedition from 
Kalgoorlie on the goldfields. 
Only two specimens were obtained, and they were in bad 
condition. No other specimens have so far been met with. 
For diagnosis see Sayce. 
CONCHOSTRACA. 
Family LiMNADIID#. 
Genus HULIMNADIA. 
Only one species had been found hitherto in Western Australia, 
and that by the Hamburg Expedition in 1905. This was 
recognised as a new species by Wolf, so that up to the date of 
