CHAIN FORMATION BY FRONTONIA. 26 1 



normal medium longer than two days. For this reason I am 

 unable to give a fuller account of the process under discussion 

 nor carry out the experimental work suggested by it. The case 

 however appears to be a unique instance of normal temporary 

 chain formation among the free-living ciliates. 



LITERATURE CITED. 

 Cepede, C. 



'10 Recherches sur les Infusoires astomes. Arch, de Zool. Exp., 5 ser., III., 



4, 1910. 

 Jennings, H. S. 



'08 Heredity, Variation and Evolution in Protozoa. Jour. Exp. Zool., V., 4, 



1908. 

 Popoff, M. 



'08 Experimented Zellstudien. Arch. f. Zellforsch., I., 2, 1908. 

 Saville Kent, W. 



'81 Manual of the Infusoria, 1881-2. 



