18 MICROSCOPICAL OBSERVATIONS. 



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



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



Cocconema cymbiforme, Ehr. Arcella dentata, Ehr. 



Eunotia gibba, Ehr. " vulgaris, Ehr. 



Surirella splendida, Ehr. — 



Synedra vitrea. Kg. Batrachospermum moniliforme, Roth. 



Terpsinoe musica, Elir. 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 BR00KE),«FA. 



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

 lowing Diatomaceae, viz : 



Amphiprora constricta, Ehr. Navicula baltica, Ehr. 



Coscinodiscus subtilis, Ehr. Stauroptera aspera, Ehr. 



*Eupodiscus radiatus, B. Triceratium faviis, Ehr. 



Gallionella sulcata, Ehr. " 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, I collected some salt-marsh grasses, 

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

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



DiATOMACE.-E. InFUSOKIA. 



Achnanthes brevipes, Ag. Carchesium polypinum, Ehr, 



Bacillaria paradoxa, Ehr. Cothurnia maritima, Ehr. 



Cerataulus turgidus, Ehr. " havniensis, Ehr. 



Meloseira salina, Kg. 



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



Triceratium favus, Ehr. PL 3, figs. 11 ife 12. 



