Four new species of mesozoansviz Dicyema ganapatii n.sp. from the renal appendages ofSepia elliptica Hoyle,Dicyema madrasensis n.sp. andDicyema octopusi n.sp. from the renal appendages of Octopus sp., andDicyema nouveli n.sp. from the renal appendages ofLoligo duvauceli d’ Orbigny are described. All the hosts were collected from different localities on the east coast of India.