560 Mr, O. A. Sayce on Three 
Crustacea, are described by Dr. Chilton in a very complete 
and valuable paper (1), to which I am greatly indebted, 
which contains not only descriptions and drawings of the 
species, but many questions are debated concerning the fauna 
of caves and wells, and also there is a carefully compiled 
bibliography upon the subject and notes thereon. 
Phreatoicus australis, Chilton (2).—This species, which 
has normal eyes, is described as occurring under stones in a 
boggy flat near thé summit (5700 feet) of Mount Kosciusko, 
which is within 200 miles of Thorpdale in a north-easterly 
direction. Mr. G. M. Thomson also records it from freshwater 
pools on the top (4100 feet) of Mount Wellington in Tas- 
mania (6), and from the same island I have also received 
specimens of it from a mountain-lake situated at an elevation 
of 2900 feet, and compared them with co-types (14). 
Phreatoicus tasmanie, Thomson (7).—This was collected 
from the Great Lake, Tasmania, which lies at an elevation of 
3800 feet above sea-level ; it also has normal eyes. 
Phreatoicus Shephardi, Sayce (12).—This was taken from 
a tiny streamlet on the north side of the Dividing Range, 
near Whittlesea, Victoria, at an elevation of about 2000 feet. 
It is without the slightest appearance of any eyes. 
Phreatotcopsts terricola, Spencer & Hall (8).—This species 
is of terrestrial habit, and is recorded as being obtained 
burrowing in earth on the hills in the dense forest near Colac, 
Victoria. It has normal eyes. 
In the following characters those of the above species 
having the closest resemblance to P. gracilis will now be 
given. I have not, however, seen the New-Zealand forms, 
but judge them from the very careful descriptions and 
drawings of Dr. Chilton. 
1. Shape of body and comparative length of antenne.— 
P. gracilis is much more slender than any other species, due 
in part to the pleura not being produced. I omitted to 
mention in my original description that the males have con- 
siderably longer antennee than the females; they are more 
than half the length of the body. In these respects it com- 
pares closely with the New-Zealand subterranean forms, and 
of these two most closely with P. typicus. ‘The body of that 
species is longer than P. ass¢milis and the pleura only mode- 
rately developed, but both are more slender than any of the 
other surface-forms except P. gracilis. 
2. Want of colour.—tlt is in agreement with the New- 
Zealand forms; all the rest have more or less of colour- 
markings. 
