240 



QUEENSLAND SPECIES OF AHCKLLA, 



Total ... 14 100 00 



Only 14 Aicella? were counted on tliis occasion, consequently 

 tlie percentage values are not so significant as in the preceding 

 tables. 



(p) 2nd Nov., 1917. 



Actual No. Percentage. 

 A . vulyaris ... G 18-18 



A. discoides ... 3 9-09 



A.mitrata ... 15 45 45 



A. artocrea ... 9 27-28 



(q)30t.h Nov., 1917. 

 Actual No. Percentage. 

 1 20 



1 20 



2 40 

 1 20 



Total 



33 



100-00 



100 



In figs. 1-4, the lines connecting the values of this date with 

 those of 2nd November on the one hand, and 30th December on 

 the other, are broken to indicate that little importance should 

 be as.sociated with them, as the total number actually counted is 

 too small to convey much meaning. On this occasion, Arcella? 

 for counting were extremely rare. 



(r) 29th Dec, 1917. 

 Actual No. 

 A. vulgaris ... 26 



A. discoides ... 5 



A. mitrata ... 14 



A artocrea ... 5 



Percentage. 

 52 

 10 



28 

 JO 



Total 

 (2). Locality, Bribie Island. 



A . vulyaris . . . 

 A. mitrata ... 



50 



100 



Date, early in April, 1915. 



Actual No. Percentage. 

 23 60-53 



15 39-47 



Total 



38 



10000 



