April, 1917. The Queensland Naturalist. 
69 
A NOTE ON SOME FRESHWATER RHIZOPODA FROM 
STRADBROKE ISLAND, MORETON BAY. 
By C. D. Gillies, M.Sc., University, Brisbane. 
During the Easter trip, 1917, of the Field Naturalists’ 
Club to Myora, Stradbroke Is., I obtained some squeezings 
of wet Sphagnum, and a sample of sediment from a stagnant 
pool, for the examination of Freshwater Rhizopoda. The 
material was preserved in weak formalin, by adding a few 
drops of the strong preservative to the contents of each tube. 
I have found that ^cohol and mixtures of alcohol and formalin, 
such as Kofoid’s Plankton fluid (70 per cent, alcohol 98 parts, 
strong formalin 2 parts) are unsuitable media for subsequent 
microscopical examination of the material, on account of 
the fonnation of currents. 
There are two accepted classifications of the Freshwater 
Rhizopoda. Some prominent authorities divide the sub- 
class into two orders, viz., Conchulina and Ameobina, 
according to the presence or absence of a test ; others regard 
the character of the pseudopodia as being more satisfactory, 
and group those with long, pointed pseudopodia into the order 
Filosa, while forms with blunt, rounded ones comprise the 
order Lobosa. Difflugiella, a genus described by Cash in 
1904, is' an intermediate form between the Filosa and Lobosa 
on account of the possession of pseudopodia of both kinds. 
Twenty-one species were identified, all of which except 
Sphenoderia dentata. Pen., were present in the Sphagnum 
material, but only seven were observed from the stagnant 
water, these being indicated below by an asterisk ("^). 
The following is a list of the species identified : — 
Phylum Protozoa. 
Class Sarcodina. 
Sub-class Rhizopoda. 
Order Lobosa. 
1. Arcella discoides, Ehrenb. 
2. Arcella gihhosa, Pen. 
3. ^Centropyxis aculeata (Ehrenb) Stein. 
4. Difflugia acuminata, Ehrenb. 
5. Nebela harbata, Leidy. 
6. Nebela ca%idata, Leidy. 
7. Nebela collaris (Ehrenb) Leidy. 
8. Nebela tubulata, Brown. 
9. Quadrulella symmetrica (Wallich) Cockerell. 
