192 FRANK M. SURFACE. 



fixed colonies. While the occurrence of colonies or swarms is 

 common in the animal kingdom, I have seen no accounts of 

 colony formation in other groups that resembles the processes 

 seen in these rotifers. 



BIOLOGICAL HALL, UNIVERSITY OF PENNSYLVANIA, 

 May I, 1906. 



LITERATURE CITED. 

 Huxley, T. H. 



'53 Lacinularia socialis ; a contribution to the Anatomy and Physiology of the 

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Hudson and Gosse. 



'89 The Rotifera. Two volumes, London. 



Joliet, Lucien. 



'83 Monographic des Melicertes. Arch, de Zool. Exp. et Gen., 2 e Series, 

 Tome I., pp. 131-224. 



Montgomery, T. H. 



'03 On the Morphology of the Rotatorian Family, Flosculariadre. Proc. Acad. 

 Nat. Sci. of Philadelphia. 



Thorpe, V. Gunson. 



'89 Description of a New Species of Megalotrocha. Journ. Royal Micros. 



Soc., pp. 1-4. 

 '93 The Rotifera of China. Journ. Royal Micros. Soc., pp. 145-152- 



