[None. Introduction as follows:]
Although the biology of the Windowpane Oyster (Placuna placenta) of Tambalagam Lake has received much attention in the past, very little is known of the other fauna of the lake. The present report deals with the polychaete worms collected during a survey of the oyster beds of the lake in November 1959. The collection contains twenty species, of which thirteen, including a nereid genus, are new to science and four are new to the fauna of Ceylon.
