The present paper is the outcome of regular plankton and hydrological
investigations off West Hill, Calicut, for' the three years 1948-5l.
There has been very little detailed work done on the plankton and
hydrology of Indian coastal waters, especially along the West Coast of
India except for the account of the seasonal fluctuations of the plankton
of the Trivandrum Coast by Menon (1945) and notes on the plankton
of the Malabar Coast by Hornell and Nayidu (1923) and of the Bombay
Harbour by Bal and Pradhan (1945) and Gonzalves (1947)
