3IO American Quarterly Microscopical Journal. 



Sp. obscura, Rlfs. With several bands of chlorophyll. 



17. Cien Fleurotcenium, Ng. Cells cylindrical or spindle-shaped^ 

 with median constriction ; chlorophyll in longitudinal bands. 



F. baculum, d. B. Cells 0.25 1., slim, straight, somewhat turgid 



each side of the constriction, ends blunt. 

 P. turgidum, Breb. Cells about half so broad as long. 



18. (len. Tetmemorus, Rlfs. Cells cylindrical or spindle-shaped, 



constricted in the middle, ends carved. 

 T. Brebissojiii, Rlfs. Cells spindle-shaped 0.09—0.18 1., with 

 finely dotted longitudinal stripes. 



19. Cien. Palmogla'a, Ktz. Cells elongate, round ; chlorophyll 



in longitudinal bands ; copulation by complete fusing to- 

 gether of the cells. 

 P. macrococca, A. B. Common in moist places, out of water. 



HUDITOK.IJk.L. 



ANNOUNCEMENT. 



With the close of the first volume the publishers desire to 

 express their sincere thanks for the liberal encouragement and 

 support with which they have been favored during the past 

 year. 



It has been their earnest wish to establish a Microscopical 

 Journal which would be creditable to themselves and to the 

 country. Each number has been an improvement upon the 

 preceding, even the present one has defects which could not 

 be remedied without sacrificing too much the unity of the volume. 

 Still, we do not hesitate to invite fair criticism of the typography 

 and press-work in this number, which we believe could not be 

 excelled, under the circumstances, and certainly never has been in 

 any scientific periodical heretofore published. For the high posi- 

 tion among scientific journals which the Quarterly already 

 occupies, we are to a great extent indebted to the original work of 

 American authors. This fact speaks well for their energy and 

 interest in the study of science ; as much of the work was done 

 at a time when there was no suitable journal through which the 

 results could be given to the world. With the encouragement 

 offered by a well-established periodical devoted to Microscopical 



