TABLE OF CONTENTS. 



Page. 



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 dentatus 18 



Genus Bathyplax 19 



Bathyplax typhla 19 



Genus Pilumnoplax 21 



Pilumnoplax americana 21 



elata 23 



Subfamily Goneplacinae 1 24 



Genus Goneplax 25 



Goneplax barbata 26 



sigsbei 26 



rosaea 27 



hirsuta 28 



tridentata 29 



Subfamily Prionoplacinae 29 



Genus Prionoplax 29 



Prionoplax atlantica 30 



ciliata 31 



Genus Tetraplax 32 



Tetraplax quadridentata 32 



Genus Euryplax 34 



Euryplax nitida 34 



polita 36 



Genus Chasmophora 37 



Chasmophora macrophthalma 37 



Genus Speocarcinus 38 



Speocarcinus carolinensis 39 



granulimanue 40 



ostrearicola 41 



calif ornien sis 42 



Genus Pseudorhombila 42 



Pseudorhombila octodentata 43 



Genus Oediplax 44 



Oediplax granulate 44 



Genus Cyrtoplax 45 



Cyrtoplax spinidentate 46 



