NOTES ON AN APPARENTLY NEW SPECIES 
OF HYALINE DAPHNIA, 
By W. R. COLLEDGE. 
Read before the Royal Society of Queensland, 27th October, 1906. 
In examining the pond life around Brisbane, I have 
found a very interesting and unusual species of Hyaline 
Daphnia. A great deal of systematic work has been done 
on these insects in England, Europe, and the States of 
America. But none of the forms illustrated resemble 
this species. It stands out distinctly trom all others by 
its peculiar shape, and unusual size. The same species 
has been noticed in Victoria by Mr. Hallam. the Secretary 
of the Hawthorne and Camberwell Microscopical Society, 
but that is the only reference that I have been able to 
find upon the subject 
The Daphnias, or Water Fleas, belong to the order 
of Entomostraca, or shelled insects. The branched antennz 
places them in the sub-order of the Claderocera. The 
Hyaline species were discovered by Professor A. Lehdig, 
in the Lakes of Switzerland, and are so named on account 
of their pellucid character. Seven species are known in 
England, and two more in America. The variations of 
form in each species is considerable. The typical character, 
of which I give an illustration taken from the Year Book 
of Microscopy, is “ Daphnia Hyalina.”” Two other forms 
are also figured from America. One from Lake St. Clair, 
the other from Lake Gogebic. Some of the varied forms 
that have been noticed may be of the same species, only 
taken at different periods otf their development. Their 
transparency renders them objects of great interest, as 
