18 MICROSCOPICAL OBSERVATIONS. 



BIG HILLSBOROUGH RIVER, ON THE ROAD FROM PILATKA TO TAMPA. 



In this river I noticed the following species in a living state : 



Cocconema eymbiforme. Ehr. Arcella dentata, Ehr. 



Eunotia gibba, Ehr. " vulgaris, Elir. 



Surirella splendida, Ehr. 



Synedra vitrea, Kg. Batrachospermum moniliforme, Roth. 



Terpsinoe musica, Ehr. Spirogyra decimina, Kg. 



It was at this locality that I first saw living chains of that exquisite form, the 

 Terpsinoe musica, Ehr. The frustules contained yellowish endochrome and 

 granules, irregularly scattered. 



VICINITY OF TAMPA, (FORT BROOKE), FA. 



The mud of a salt-marsh, half a mile east of Fort Brooke, furnished the fol- 

 lowing Diatomacea?, viz : 



Amphiprora constricta, Ehr. Navicula baltica, Ehr. 



Coscinodiscus subtilis, Ehr. Stauroptera aspera, Ehr. 



*Eupodiscus radiatus, B. Triceratium favus, Ehr. 



Gallionella sulcata. Elir. reticulum, Ehr. 



TAMPA. continued. 



On the shores of Hillsborough River, near the Hotel at Tampa, I noticed that 

 the sand below high-water mark was of the peculiar yellowish or ferruginous tint 

 which often indicates the presence of living Diatomacese. Microscopical observa- 

 tions proved the presence of large numbers of a species of Amphiprora, (see figs. 

 2, 3, 4, PL 2,) whose living frustules showed four parallel yellowish bands, and 

 which I shall refer to as Amphiprora fasciata, B. A small sigmoid Navicula, pro- 

 bably N. sigma, Ehr., accompanied the Amphiprora. 



About a mile and a half above the Hotel,! collected some salt-marsh grasses, 

 attached to which were great quantities of Delesseria Leprieurii, Mont., and 

 Bostrichia scorpioides ? and among these Alga? I detected the following : 



DIATOMAUE.K. INFUSORIA. 



Achnanthes brevipes, Ag. Carchesium polypinum, Elir. 



Bacillaria paradoxa. Ehr. Cothurnia niaritima, Ehr. 



Cerataulus turgidus, Ehr. liavniensis, Ehr. 

 Meloseira salina, Kg. 



Stauroptera aspera, Ehr. Figures of these species of Cothurnia are given on 



Triceratium favus, Ehr. PI. 3, figs. 11 & 12. 



