MICROSCOPICAL OBSERVATIONS 21 



In a grayish slime covering the creek west of St. Augustine I found 



Amphiprora alata, Ehr. See figs. 8, 9, 10, PI. 2. Pinnularia interrupt;!, Ehr. 



Amphora libyca, Ehr. Rhaphoneis rhombus, Ehr. 



In a fresh-water pond, on St. Anastasia Island, near St. Augustine, I found on 

 the 26th March, 1850, the following, viz : 



ALG/E. DIATOMACE.E. 



*Aporea ambigua, B. Himantidium arcus, Ehr. 



Chaetophora pisiformis, Ag. Cocconeis pediculus, Ehr. 



Coleochcete scutata, Bre'b. Pinnularia viridis, Ehr. 

 In fmit, abundant on petioles of Sagittaria. 



Arcella vulgaris, Ehr. 



O ' 



*Pterodina magna, B. 

 Rotifer vulgaris, Schr. 

 Stentor polymorphic, Ehr. 



ST. ANASTASIA ISLAND. continued. 



On the " Coquina" Rocks, near the light-house, on Anastasia Island, I found 

 the following forms, viz : 



ALG.E. DIATOMACE^E. 



Ceramium rubrum, Ag. Achnanthes minutissima, Kg. 



Gelidium corneum, Huds. Rhipidophora crystallina, Kg. 



Laurencia dasyphylla, Woodw. Schizonema quadripunctata, Ag. 



Rhabdonia Bailey i, Harv. 



Acineta Lyngbyi ? Ehr. See fig. 16, PI. 3. 



On the sands of the above locality 1 noticed yellowish spots, which owed 

 their color to great numbers of Amphiprora quadrifasciata, B., and a species of 

 Amphora, apparently new, which moved very rapidly. I have named it Am- 

 phora amphioxys, B. See page 38. 



ST. AUGUSTINE. continued. 



In fresh-water ditches in the pine barrens near. St. Augustine, I observed 

 these forms, viz : 



Closterium acerosum, Schr. Brachionus urceolaris. See fig. 17. 



" Dianse, Ehr. 



" turgidum, Ehr. Bulbochaste setigera, Ag. 



Euastrum oblongum, Ralfs. Mougeotia genuflexa, Ag. 



Staurastrum dilatatum, Ehr. Tyndaridea cruciata, Harv., in fruit. 

 Eunotia diodon, Ehr. 



