SCIENTIFIC SUEVEY. ^aj 



chalk-marls of Mendon and Caltanisetta. Possibly some of our 

 western beds may prove to be of similar origin. It is also worthy 

 of note that fossil shields of diatomaceaj have been found by Dr. 

 White of New Haven, in the hornstone of the Devonian and Silu- 

 rian beds of New York, thus carrying back the existence of these 

 frail but indestructible wonders to the very dawn of organic life. 



I will conclude this letter, which has already reached an undue 

 length, by giving a list of microscopic forms observed by my father 

 in the vicinity of Waterville, which though not by any means com- 

 plete may possibly be of service to those interested in such inves- 

 tigations. 



List of Microscopic Forms observed in Emerson's Stream, Water- 

 ville, August, 1853. 



' Melicerta ringens on leaves of Nuphar. 

 Spongilla forming patches a foot or more in circumference. 

 Arcella. 

 •^ Stentor polymorpha. 

 Vorticella. 

 Chaetonotus larus. 

 Rotifer vulgaris. 



f Tetraspora gelatinosa. 

 I Yaucheria caespitosa. 

 < Rivularia, very abundant. 



Lemania fluviatilis, very abundant. 

 l^Zygnema nitidum. 



'Euastrum verrucosum. 

 Closterium lunula. 

 Euastrum margaritaceum. 

 Docidium. 

 Micrasterias rotata. 

 Arthrodesmus quadri-caudatus. 

 Penium digitus. 



Peotozoa, 



CoNFERvoiD Algae, 



Desmidiaceae, 



i 



Diatomaceae, 



(, Eunotia gibba. 



\ Suricrella splendida. 



Along the cOast may be found the usual variety of American 

 marine forms, mostly parasitic upon the smaller Algfe. I would 

 particularly mention that the beautiful "Isthmia nervosa" occurs 

 in quantity upon the fronds of Polysiphonia at Portland. 



Hoping that the above may be the information you desire, 



I am, very sincerely yours, 



L. W. BAILEY. 

 Fredericton, N. B., Nov. 13, 1862. 



51 



