Article: The ontogeny of Theriosynoecum fittoni (Mantell)

The carapaces of Theriosynoecum fittoni (Mantell) from the uppermost Weald Clay (Lower Cretaceous) of four English localities have been measured. Nine growth stages were recognized and the shape and ornament of each stage recorded. Though change in shape is considerable, the tubercles are generally constant in number and relative position throughout development. A lectotype for the species is designated, figured, and described.