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Updated: May 9, 2025
In Eriphia gonagra the entrant orifices of the respiratory cavity serving for aerial respiration are situated, not, as in the Grapsoidae, above, but behind the last pair of feet at the sides of the abdomen. Posterior entrance to the branchial cavity of Ocypoda rhombea, Fab., natural size. The carapace and the fourth foot of the right side are removed.
In the case before us it is sufficient to refer to the Gelasimus of the mangrove swamps, which shares the same conditions of life with various Grapsoidae and yet does not agree with them, but with the arenicolous Ocypoda.
If, in the nearly allied families of the Ocypodidae and Grapsoidae, the closest agreement prevails in all the essential conditions of their structure; if the same plan of structure is slavishly followed in everything else, in the organs of sense, in the articulation of the limbs, in every trabecula and tuft of hairs in the complicated framework of the stomach, and in all the arrangements subserving aquatic respiration, even to the hairs of the flagella employed in cleaning the branchiae, why have we suddenly this exception, this complete difference, in connection with aerial respiration?
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