Calappa lophos (Herbst)

peiform expansions of carapace typically developed ,longitudinal septum of prolonged portion of endostome extends between lamellar processes from first pair of maxillipeds
lenth of carapace about two third of its greatest widt
free margins of clypeiform expansions cut into six teeth
posterior border of carapace beaded and bounded on either side by an indistinct notch

An average female measures :-

length of carapace .. 59 mm.

breadth of carapace ... 90 mm.

This species is distinguished by the smoothness of the carapace in the adult, the extreme length of which is about two-third its extreme breadth. The elypeiform expansions are well-developed, their free margins being strongly laciniate. There is no spine on the posterior border of the cara pace in the middle. The anterior border of the endostomial septum is deeply concave.

Colour pinkish, the fingers of the chelipeds yellow.

In a female specimen the present collection, there is a curved line of red ocelli present during life (although the female is an adults this disappears in spirit. Also, there is a toothed ridge near the lower border of the palm.
This species occurs commonly along the eastern coast of India, from the delta of the Hughli to as far south as Pondicherry.