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Contents: Pollution related structural and functional changes in aquatic communities with emphasis on freshwater algae and protozoa, by John Cairns, Jr., Guy R. Lanza and Bruce C. Parker; “Elliptio marsupiobesa,” A new fresh-water mussel (Mollusca: Bivalvia: Unionidae) from the Cape Fear River, North Carolina, by Samuel L.H. Fuller; Ecology of the annual grass “Setaria lutescens” on oldfields of the Pennsylvania Piedmont, by William P. Gregg, Jr.; An annual plankton cycle on the Chesapeake Bay in the vicinity of Calvert Cliffs, Maryland, June 1969-May 1970, by R.A. Mulford; Taxonomic and faunistic comments on decticine katydids with the description of several new speces (Orthoptera: Tettigoniidae: Decticinae), by David C. Rentz; The immature stages of “Paramerina smithae” (Sublette) (Diptera: Chironomidae: Tanypodinae), by Selwyn S. Roback; Three new pufferfishes (Tetraodontidae: Sphoeroides) from the southern Caribbean, by Robert L. Shipp. Illus.
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