72 EDWARD S. CASTLE. 



Oscillatoria and one species of Arthrospira were seen to rotate 

 customarily during free-swimming translation when observed 

 under similar conditions. 



REFERENCES. 

 Borzi. 



'86 Le Communicazioni intracellulari delle Nostochinee. Malpighia, i. (Re- 

 viewed in Bot. Cent., 37, 1887.) 

 Crozier, W. J., and Federighi, H. 



'24 Critical Thermal Increment for the Movement of Oscillatoria. Journ. Gen. 



Physiol., 7, 137-150. 

 De Bary, A. 



'63 Beitrag zur Kentniss der Nostocaceae insbesonderbare der Rivularien. 



Flora. 

 Phillips, O. P. 



'04 A Comparative Study of the Cytology and Movements of the Cyanophycese. 



Contrib. Bot. Lab. Univ. of Penna., Vol. II., No. 3. 

 West, G. S. 



'04 British Freshwater Algae. 



'16 Cambridge Botanical Handbooks, Vol. i, Algae. 



