246 QUEENSLAND SPECIES OF AKCELLA. 



ered in October, 1917, the only living Arcellm present were A. 

 (irtocrea. Furthermore, the two localities are about 130 miles 

 apart. Again in the occasional material collected outside the 

 period September-October \see (2), (3), (4), (5j, (8), the dominant 

 form is A. vulgaris, not A. artocrea. 



It is hoped by the collection of more data that deductions may 

 be made in connection with A. discoides and A. mitrata, as well 

 as in supplying confirmatory evidence in regard to A. vulgaris 

 and A. artocrea. 



BIBLIOGRAPHY. 



1. KoFoiD, C. A.— "The Plankton of the lUinois River, 1894-1899/' Bull. 



Illinois State Lab. Nat. Hist., viii., Art. 1, 1908. 



2. Leidy, J. — "The Freshwater Rhizopoda of N. America." 1879. 



3. Wailes, G. H. — "Freshwater Rhizopoda and Heliozoa f rom the States 



of New York, New Jersej', and Georgia, U.S.A." Journ. Linn. 

 Soc. Lond., Zool. xxxii., 1912, pp. 121-161. 



