254 Bailey on Siliceous Animalcules. 



iilamentSj very abundant in Algae at Boston, and near Marble- 

 head. 



Cocconeis scutellum 1 adhering in great quantities to Zos- 

 tera and other marine plants. 



Echinella flahellata. 



Synedra , parasitic in vast quantities on filamen- 

 tous algae covering them with a glistening envelope of a 

 brownish color. 



Tessela arcuata. 



Achnanthes hrevipes. 



Goniphonema clavatum. 



Naunema , immense quantities of one or more species 



of Naunema were observed growing on the flats, near the 

 Common. The greater part of the brown matter attached to 

 the marine plants at this situation, consists of long tubes filled 

 with siliceous animalcules of the genus Naunema. Tons of 

 them might be collected here. 



Emersonia elegans. I propose to give this name to a beau- 

 tiful siliceous animalcule found in Boston harbor, and which 

 appears to belong to a new genus. This genus I wish to 

 name Emersonia, if the President of the Boston Society of 

 Naturalists will accept so small a tribute of respect. It may 

 be characterized as follows ; 



Genus. Emersonia. 

 Family Bacillaria, Section Naviculacea. 



Carapace siliceous, compressed, central portion oblong, sep- 

 arated by deep lines of constriction from the two terminal, bi- 

 cuspidate or auricled portions, forming chains, which open in 

 a zig-zag manner. 



Emersonia elegans (See fig. 2, a, 6, c. d.) Central portion 

 nearly square, containing yellowish globules disposed in a cir- 

 cular group. Hab. Boston harbor. 



Emersonia antiqua, (Bailey's sketch of Bacillaria, PI. 2, 

 fig. 25.) Central portion much broader than long. Fossil in 

 the infusorial stratum of Richmond, Va. 



I presume that a more careful examination of the infusoria 



