Revision of the genus Gongrochanus Kier from Upper Cretaceous beds of South India has revealed the presence of seven species including its type species G. herschelianus (M'Clelland). On the basis of phyllode characters the species have been divided into two informal groups. A biometrical analysis by applying the Bartlett's and F-test proves the validity of the species described. Coefficients of correlation and regression computed for parameters of length, width and height for G. herschelianus are dependent upon one another; that change of length versus width is more regular than that of length versus height. Occurrence of this genus in Hauriceras rembda zone and Pachydiscus otacodensis zone of Kallankurichchi and Ottakkovil formations respectively of Ariyalur Group helps in rectifying its geological age which now can be taken as extending from Lower Maestrichtian to Middle Maestrichtian instead of Senonian.

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In the light of the present authors' work on subfamily Ostreinae from the Cretaceous of India, it was felt desirable that the two informal groups non-incubatory and iacubatory genera of Stenzel in this Subfamily, be raised to the status of tribes as Crassostreini and Ostreini respectively on par with tribe Flemingostreiai Stenzel. Also two new non-incubatory genera Cussetostrea and Soleniscostrea are proposed here based on the type species as Crassostrea cusseta Sohl and Kauffman and Crassostrea soleniscus (Meek) respectively.

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