Genus Paradasygyius, n. gen 80 



Paradasygyius depressus (Bell), n. comb 81 



Genus Pyromaia Stimpson 85 



Pyromaia tuberculata (Lockington) 85 



Pyromaia tuberculata mexicana Rathbun, n. comb. . . 85 



Genus Erileptus Rathbun 91 



Erileptus spinosus Rathbun 91 



Genus Inachoides Milne Edwards and Lucas 95 



Inachoides microrhynchus Milne Edwards and Lucas ... 96 



Inachoides laevis Stimpson 98 



Genus Podochela Stimpson 101 



Podochela hemphilli (Lockington) 104 



Podochela angulata Finnegan 108 



Podochela veleronis, n. sp Ill 



Podochela latimanus (Rathbun) 113 



Podochela lobifrons Rathbun 116 



Podochela schmitti Garth 119 



Podochela vestita (Stimpson) 121 



Podochela margaritaria Rathbun 125 



Podochela ziesenhennei Garth 127 



Genus Stenorynchus Lamarck 129 



Stenorynchus debilis (Smith) 130 



Subfamily Oregoniinae, n. subf 134 



Genus Oregonia Dana 135 



Oregonia gracilis Dana 136 



Oregonia bifurca Rathbun 140 



Genus Hyas Leach 142 



Hyas lyratus Dana 142 



Hyas coarctatus alutaceus Brandt 146 



Genus Chionoecetes Kroyer 148 



Chionoecetes opilio (O. Fabricius) 150 



Chionoecetes bairdi Rathbun 153 



Chionoecetes tanneri Rathbun 156 



Chionoecetes angulatus Rathbun 159 



Subf amily Ophthalmiinae 161 



Genus Pitho Bell 162 



Pitho sexdentataBtW 163 



Pitho picteti (Saussure) 166 



Pitho quinquedentata Bell 170 



Genus Tyche Bell 172 



Tyche lamellifrons Bell 173 



Tyche clarionensis, n. sp 176 



Tyche galapagensis, n. sp 178 



viii 



