VI.—South American Rotifera

IN the years 1911-1912, I had the opportunity to study the Rotifera in most of the countries of South America, from the Tropics t o the Straits of Magellan.A report 011 those of Bolivia and Peru has appeared elsewhere (2?4).*This paper deals with the Rotifera of Brazil, Chile, and Argentina, and contains additional notes on those of Bolivia, Peru, and British Guiana.A summary will be given of all that is known * The figuree in brackets refer to the Bibliography at the end of the paper.