Pseudechetus fimbriatus gen. et sp.nov. from the throat of a carangid is described. The new genus has the closest resemblance to Parechetus Pillai from which it differs in the presence of 4 processes instead of 2 on the genital segment and a pair of processes on the abdomen instead of wings. The sternal fork carries accessory tines anteriorly making it a double structure.

In the present paper seven species of cymothoid isopods parasitic on the marine fishes of the Kerala coast are described. A preliminary diagnosis of three of them was published earlier (Pillai, 1954). Full descriptions of all the species are given below. The larval stages described were in all cases taken from the brood pouch. The present work forms part of a thesis for which the author was awarded the Ph.D. Degree by the Kerala University.

A collection of copepods from marine fishes, mainly elasmobranchs from South India was examined. Nine species are described of which six are new, one belonging to a new genus. The species described are Caligus dasyaticus Rangnekar, C. lepeophtheropsis sp.nov. Pseudopetalus dussumieri (Rangnekar), Dissonus sp., Nesippus vespa Kirtisinghe, Kroyeria minuta sp.nov., Eudactylina lancifera sp. nov., E. alata sp.nov., and Eudactylinopsis curvatus gen.nov., sp.nov.