558 Mr. O. A. Sayce on Three 
species (see ‘Manual of Conchology,’ vol. ix. pl. xxii. 
figs. 7 & 8), but it is less than a third of the size; both are 
from the same locality. In the new species it will be observed 
that of the two basal tubercles that one nearest the colu- 
mella is remarkably strong and bends towards the left, the 
other, which is much smaller, in the opposite direction. 
LX XII.—On Three Blind Victorian Freshwater Crustacea 
found in Surface-water. By O. A. SAYCE. 
Durtin@ a collecting excursion in the district of Gippsland, 
Victoria, I found, amongst a number of normal inhabitants 
of a little freshwater runnel, three blind species of Crustacea. 
Two of these are Isopods, but members of different tribes, and 
the other one is an Amphipod. 
The fact of these widely separated forms, each being blind, 
inhabiting surface-water in the same locality, with proof of 
their breeding there, is, I consider, of special zoological 
interest, pointing, as they apparently do, to a cave or sub- 
terranean origin; but when and how they have changed their 
habitat, and, reverting back, entered the struggle for existence 
with the surface-fauna, I am unable to decide. 
I shall now enumerate the blind species and describe the 
place in which they were found and the leading geological 
features of the surrounding country so far as my limited 
knowledge will allow. 
Enumeration of the Species. 
No. 1. Phreatoicotdes gracilis, Sayce (9).—This species 
was taken from running water, and in all some twenty indi- 
viduals were collected, comprising males and females of 
different sizes, and one with eggs in the marsupium. ‘They 
were found mostly within crevices of logs and amongst the 
matted fibres of dead tree-fern trunks lying in the water. 
No. 2. Janirella pusilla, Sayce (11).—About a dozen males 
and females were collected from a bunch of dead moss in a 
small pool within a few yards of the streamlet formed 
through the uprootal of a large Kucalypt. Many of them 
had developing young in the marsupium. 
No. 3. Niphargus pulchellus, Sayce (10).—Only three 
individuals were found, and each was taken from the same 
little pool as Janirella pusilla, 
