I'HE COMPONENTS PEli MONTH OF THE 

 UHIZOPODAN FAUNA OF A BRISBANE LAGOON. 



By C. D. Gillies, M.Sc, 

 Biology Dept., University of Queensland. 



(Bead before the Royal Society of Queensland, 2'7th May, 1918). 



The lagoon which was selected for this investigation 

 is situated in the Brisbane Botanic Gardens, near the old 

 bird house, and material for examination was collected 

 approximately at the end of each month from January — 

 December, 1917. 



The following are the monthly lists of Rhizopods, 

 the forms indicated by an asterisk * being represented 

 only b}^ empty tests : — 



I. January (collected 30th Jan.): — Arcella artocrea 

 Ldy., *A. discoides Ehr., A. mitrata Ldy., A. vulgaris Ehr., 

 ^Centrojyyxis aculeata Stn., ^Difflugiu const ricta Ldy., 

 D. lobostoma Ldy., D. oblonga Ehr., * Euglyjjha acantho%thora 

 Ehr., E. tubo'culata Duj., * Trine tna enchelys Ldy. 



Arcella vulgaris was numerous, and one specimen was 

 observed in the amoebula condition. 



II. February (collected 28th Feb.): — Amoeba 'proteus 

 Ldy., A. radiosa Ehr., Arcella artocrea Ldy., A. discoides 

 Ehr., A. mitrata Ldy., A. vulgaris Ehr., Centropyxis 

 aculeata Stn., Difflugia lobostoma Ldy., D. oblonga Ehr., 

 Euglypha acant1io2')hora Ehr., E. tuberculata Duj., *Trin£ma 

 enchelys Ldy. 



A number of large Difflugia oblonga was present, 

 which appeared to range from the typical pjTlform 

 condition to acuminate. 



