National Geographic : 1928 Jul
CRABS AND CRABLIKE CURIOSITIES OF THE SEA () National Geographic 5oclety SWIMMING CRABS All swimming crabs have the rearmost of their five pairs of feet modified so as to function like paddles. Consequently they are able to rove for considerable distances, which they seem to do in crowds. All are agile in their movements, and they are armed with very strong claws. The upper is the Iridescent Crab, Ovalipes iridescens, from deep water in the Dutch East Indies; the lower, known as the Lady Crab, is Ovalipes ocellatus.