■."Si 



PETERSBURG 



82°46W. 



Figure 2. — Collecting stations 1 to 19, Boca Ciega Bay, Fla., between Johns Pass and Corey Causeway. 



We washed samples for benthic organisms on 

 a24-mesh sieve which had an opening of 0.701 mm. 

 and fixed the material retained by the sieve in a 

 10 percent sea-water Formalin ' mixture. A 

 protein stain (rose bengal) was added to fa- 

 cilitate the separation of small organisms from 

 debris. Identified animals were preserved in 70 

 percent isopropanol. 



' Trade names referred to in this publication do not Imply endorsement 

 of commercial products. 



We identified 168 species of mollusks repre- 

 senting 69 families; of these, representatives of 

 156 species were collected live. We based deter- 

 minations on standard taxonomic works (Clench, 

 1941-69; McLean, 1951; Olsson, Harbison, Fargo, 

 and Pilsbry, 1953; Abbott, 1954, 1968; Perry 

 and Schwengel, 1955; Warmke and Abbott, 1962; 

 Keen, 1963; Wagner and Abbott, 1967; an un- 

 published report by Bullock and Boss (see foot- 

 note 2), and collections at the University of 



DISTRIBUTION OF MOIXUSKS IN AN ESTUARY 



301 



