TABLE OF CONTENTS. 



FAge. 



Introduction 1 



Sources of material 1 



Special researches 2 



Acknowledgments^ 3 



Explanation of terms and abbreviations used 6 



The grapsoid or catometopous crabs of America 9 



Systematic discussion 11 



Family Goneplacidae 15 



Subfamily Carcinoplacinae 17 



Genus Trizocarcinus 17 



Trizocarcinus dentatue 18 



Genus Bathyplax 19 



Bathyplax typhla 19 



Genus Pilumnoplax 21 



Pilumnoplax americana 21 



elata 23 



Subfamily Goneplacinae 24 



Genus Goneplax 25 



Goneplax barbata 26 



sigsbei 26 



rosaea 27 



hirsuta 28 



tridentata 29 



Subfamily Prionoplacinae 29 



Genus Prionoplax 29 



Prionoplax atlantica : 30 



cilia ta 31 



Genus Tetraplax 32 



Tetraplax quadridentata 32 



G enus Euryplax 34 



Euryplax nitida 34 



polita 36 



Genus Chasmophora 37 



Chasmophora macrophthalma 37 



Genus Speocarcinus 38 



Speocarcinus carolinensis 39 



granulimanus 40 



ostrearicola 41 



californiensis 42 



Genus Pseudorhombila 42 



Pseiidorhombila octodentata 43 



Genus Oediplax 44 



Oediplax granulata 44 



Genus Cyrtoplax 45 



Cyrtoplax spinidentata 46 



