CONTENTS. 



I. Fossil Marine Diatomaceae in California .... 

 II. New Species of Limnias ...... 



III. New Species of Auliscus ...... 



IV. American locality of Amphitetras antedeluviana, Ehr. 



V. American localities of Tetragramma .... 



VI. New Species of Diatomaceae ..... 



VII. On the Microscopic forms found in the Croton Water, in New York City 

 VIII. Two New Species of the Genus Peridinium 

 IX. New Species of the Genus Cothurnia . . . 



X. American Species of the Genus Monactinus 



XI. On some New Test Objects ..... 



XII. Marine Diatomaceae of Halifax, Nova Scotia . . . 



XIII. New Genus of Diatomaceae ..... 



PAGE 



3 

 4 

 4 

 6 



r 



8 

 11 

 12 

 13 

 14 

 14 

 15 

 15 



PUBLISHED BY THE SMITHSONIAN INSTITUTION, 



WASHINGTON, D. C. 



FEBKUAUY, 1854. 



