Abstract
The 1st zoeal stage of E. nux Milne Edwards is described and the available information on leucosiid larvae is reviewed. A comparison of the zoeal characters of the Leucosiidae, particularly of the telson and the cephalothoracic appendages, with those of other brachyurans provides no evidence for the inclusion of this family in a distinct oxystomatous group along with the dorippids and calappids. The leucosiids appear to be highly evolved catometopous crabs, most closely related to the pinnotherids and somewhat less closely to the ocypodids.

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