THE AUSTRALIAN NATURALIST. 13 
Having secured some of the larvae from the salt pools at 
Cronulla mentioned by Miss Froggatt, I kept them in an 
open-mouthed glass vessel covered with muslin; the water 
gradually evaporated until it was about one-third of its 
initial volume, when the last of the larvae died. The 
increasing salinity of the water seemed to stunt the 
growth of the larvae, which increased very little in size, 
and died one by one. The last one died in August, after 
being kept from February, 1917. At this stage the resi- 
dual water had a Sp. Gr. 1.165, which is equivalent toa 
salinity of nearly 22 per cent. of salt. Sea water con- 
tains about 84 per cent. of salts, so in above instance the 
larvae lived in a concentration of more than six times that 
of sea water. They appeared to feed on the green conferve 
which grew in the water. 
BOTANICAL NOTES. 
EXCURSION TO HEATHCOTE. 
There is an association of plants on the banks of the 
Woronora River at Heathcote such as may be found in 
the gullies on the lower slopes of the Blue Mountains, 
many of which are confined to this sector of the Port Jack- 
son district. In some of the species we have no evidence 
of connecting links between these localities, and it would 
be of interest if members would note any such occur- 
rence which may come under their observation. The 
shapely Grevillea asplenifolia has elongated racemes of 
bright purplish-grey flowers (now in bud), and leaves 
with a silvery sheen on the hairy undersurface rivalling 
that of the famous ‘‘Silver Leaves’? of Table Mountain, 
Leucodendron argentea. This species, which does not as- 
cend the Blue Mountains beyond. Lawson, reaches the 
Woronora via the Nepean and Georges Rivers, travelling 
along the river banks, its customary habitat. This hand- 
some shrub is exceptionally adaptable, and is easily grown 
in the sandy soil of the Port Jackson district. (See note 
in this journal for April, 1914.) Conospermum tenutfo- 
lium, a plant with lilac-coloured flowers and grass-like foli- 
‘age, which forms matted tufts on the shady banks of the 
stream, descends from the higher altitudes on the Blue 
Mountains to the neighbourhood of Lawson, and is not 
