BY C. D. GILLIES. 81 



Only one specimen of Difflugia leidyi seen : it was an 

 empty test provided with three cornua. This record is 

 beHeved to be the first for Australia. 



VIII. August (collected 31st Aug.): — Arcella artocrea 

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

 *Centwpyxis aculeata Stn., ^Difflugia corona Wa'lich 

 (spineless), D. oblonga Ehr., *Z). lobostoma Ldy., "^Eughfpha 

 acanthophora Ehr., *E. tuberculata Duj., Pareuglypha 

 reticulata Pen., Trinema enchclys Ldy. 



IX. September (collected 28th Sept.): — Arcella 

 artocrea Ldy., A. discoides Ehr., A. mitrata Ldy , A. 

 vulgaris Ehr., *Centropyxis aculeata Stn., Euglypha 

 acanthophora Ehr., *E. compressa Cart., *E. tuberctilata 

 Duj., -^'Trinema enchelys Ldy. 



X. October (collected 2nd Nov.): — Arcella artocrea 

 Ldj^, A. discoides Ehr., A mitrata Ldy., A. vulgaris 

 Ehr., Centropyxis aculeata Stn., ^Difjlugia lobostoma \^dy., 

 *D. oblonga Ehr., Euglypha acanthophora Ehr., *^. tuber- 

 culata Duj., Trinema enchelys Ldy. 



In a 9-spined test of Centropyxis aculeata two of the 

 spines were united at their bases, forming a double spine. 

 This type of variation in connection with, the spines of 

 C. aculeata is uncommon. 



XI. November (collected 30th Nov.): — Arcella 

 artocrea lidy., A. discoides ^hv., A. mitrata Ltdy., A. vulgaris 

 Ehr., ^Centropyxis aculeata Stn., * Difflugia corona WaUich 

 (unspined), D. lobostoma Ldy., D. oblonga Ehr., "^Euglypha 

 acanthopjhora Ehr., ^E. tuberculata Duj., Trinema enchelys 

 Ldy. 



Arcella discoides tests were common, apparently the 

 material was collected soon after a maximum for the 

 species. 



XII. December (collected 29th Dec.) :— Arcella 

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

 Ehr., Centropyxis aculeata Stn., *C. ecornis Ldy., 



* Difflugia corona Wallich (spineless), D. oblonga Ehr., 



* Euglypha acanthophora Ehr., *E. tuberculata Duj. 



* Trinema enchelys Ldy. 



