I 



20 MICROSCOPICAL OBSERVATIONS. 



ST. AUGUSTINE, FA. 



March 16th, 1850. — The mud of the St. Sebastian River, collected at the 

 bridge west of St. Augustine, proved to be very rich in siliceous shells of recent 

 and living Diatomaceae, among which the following were noticed, viz : 



Actinoptyciius senari-us, Ehr. fNavicula elongata. 

 Actinocyolus, several species. " baltica, Ehr. 



Biddulphia- pulchella, Gray. *Pinnularia Couperi, B. 

 Coseinodiscus excentricus, Ehr. " lyra, Ehr. 



" hneatus, Ehr. *Pyxidicula compressa, B. 



" oculus-iridis, Ehr. Rhaphoneis rhombus, Ehr. 



" subtihs, Ehr. Stauroptera aspera, Ehr. 



Dityooha fibula, Ehr *Surirella circumsuta, B. 

 *Eupodiscus radiatus, B. " splendida, Ehr. 



" Rogersii, Ehr. Triceratium favus, Ehr. 



i 



GallioneUa sulcata, Ehr. " hexagonalis, B.- 



Meloseira salina, Kg. Zygoceros rhombus, Ehr. 



The following Alg* were found at the same place, viz : 



Bostrichia scorpioides ? Mont. Porphyra vulgaris, Ag. 



Delesseria hypoglossum, Lamour. Ulva latissima, L. 



" Leprieurii, Mont. 



ST. AUGUSTINE. — Continued. 



In the mud at the foot of the sea wall, near the old Spanish Fort St. Marco, I 

 noticed the following Diatomaceae, viz : 



Ceratoneis closterium, Ehr. very active. Grammatophora marina, Ehr. 



Coseinodiscus lineatus, Elir. Navicula baltica, Ehr. 



" radiatus, Ehr. " sigma, Ehr. 



" subtilis, Ehr. 



The following Alga? were also noticed at the same locality, viz : 



Bostrichia scorpioides ? Mont. Gracilaria multipartita, Clem. 



Callithamnion, undetermined. Rhabdonia Baileyi, Harv. 



Ectocarpus siliculosus, Lyngb. Spyridia filamentosa, Wulf. 

 GeUdium corneum, Lamour. 



f Specimens which I received from London, agreeing well with our own, were marked N. elongata, but 

 by whom they were so named I do not know. I had been in the habit of calling it N. diagonalih, but had 

 not published any notice of it. Its delicate diagonal, transverse, and longitudinal rows of dots make it an 

 interesting microscopic object. 



