MICROSCOPICAL OBSERVATIONS. 

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



21 



Ampliiprora alata, Ehr. See figs. 8, 9, 10, PL 2. 

 Amphora libyoa, Ehr. 



Pinnularia interrupta, 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^. 

 *Aporea ambigua, B. 

 Cheetophora pisiformis, Ag. 

 Coleochcete scutata, Breb. 

 In fruit, abundant on petioles of Sagittaria. 



Arcella vulgaris, Ehr. 

 *Pterodina magna, B. 

 Rotifer vulgaris, Schr. 

 Stentor polymorphus, Ehr, 



DlATOMACE^. 



Himantidium arous, Ehr. 

 Cocconeis pediculus, Ehr. 

 Pinnularia viridis, Ehr, 



ST. ANASTASIA ISLAND. — continued. 



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

 the following forms, viz : 



Alg^. 

 Ceramium rubrum, Ag. 

 Gelidium corneum, Huds. 

 Laurencia dasyphylla, Woodw. 

 Rhabdonia Baileyi, Harv. 



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



DiATOMACEiE. 



Achnanthes minutissima. Kg. 

 Rhipidophora crystallina. Kg. 

 Schizonema quadripunctata, Ag. 



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. ■ 

 " Dianae, Ehr. 



" turgidum, Ehr. 



Euastrum oblongum, Ralfs. 



Staurastrum dilatatum, Ehr. 



Eunotia diodon, Ehr. 



Brachionus urceolaris. See fig. 17. 



Bulbocheete setigera, Ag. 

 Mougeotia genuflesa, Ag. 

 Tyndaridea pruciata, Harv., in fruit. 



