(1) Among seven species of Cyclops encountered in four water ponds kept under observation in Delhi during 1973-74 period, six specimens of Mesocyclops leuckarti (Claus, 1857) were found to harbour juvenile stages of Acanthosentis dattai Podder, 1938, parasite of the freshwater fish of the genus Barbus.
(2) An isolation procedure is reported for ricin variants from Ricinus communis seeds by using lactamyl-Sepharose affinity matrix, similar to that reported previously for variants of abrin from Abrus precatorius seeds [Hegde, R., Maiti, T. K. & Podder, S. K. (1991) Anal.