ORIGINAL COMMUNICATIONS. 



On American Diatomace.e. By Arthur M. Edwards, Esq., 

 New York, U. S. 



A paper of mine, on American Diatomaceae, was read 

 before the London Microscopical Society, March 30th, 1859, 

 and published in their Transactions, in which an omission 

 occurred which I herein wish to rectify. A mistake occurred 

 in re-writing, so that the description of the species found at 

 Charleston harbour, S. C, was left out. A paper on this 

 subject, by the present writer, was read before the New York 

 Lyceum of Natural History, February 21st, 1859, a copy of 

 which is annexed : — 



On the Microscopic forms of the Harbour of Charleston, South 

 Carolina. 



In the year 1850, Professor Bailey published in the ' Smith- 

 sonian Contributions to Knowledge/ a list of the microscopic 

 organisms which he had found in mud collected from the logs 

 of wharves, and from other situations in the harbour of 

 Charleston, S. C, which contained two new species, besides 

 many other curious forms; and in the year 1853, he de- 

 scribed four species of Ehrenberg's genus Auliscus, three of 

 which are also found at Charleston, though Bailey failed to 

 detect them. Bailey's list is as follows : — 



Actiniscus sirius, Ehr. Navicula sigma, Ehr. 



Actinoyclus bioctonarius, Ehr. Pinnularia iuterrupta, Ehr. 

 Actiuoptychus senarius, Ehr. „ didyma, Ehr. 



Biddulphia pulchelia, Gray. „ lyra, Ehr. 



Coccoueis scutelluiu, Ehr. Raphoneis rhombus, Ehr. 



Coscinodiscus ecceutricus, Ehr. Stauroptera aspera, Ehr. 



Dictyocha fibula, Ehr. *Surirella circumstuta, B. 



Eupodiscus Rogersii, Ehr. Terpsina musica, Ehr. 



* „ radiatus, B. Triceratium favus, Ehr. 



Gaillionella sulcata, Ehr. „ alternaus, B. 



Certain of these have been re-named by later observers, 



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