Index to Centra, 



197 



INDEX TO GENERA. 



Aforia 138, 139 



Agelacrinu* 73 



Agriolimax 102, 105 



Amblyacrum 153, 154 



Ancistrosyiiux 138 



Antiplanes 129, 138, 139 



Archa< ocidaris 7, 11, 19, 45-68, 70, 



71 

 Asthenotoma 148, 149 



Bathytotna 138, 147, 148, 151 

 Bela 1G0, 164 

 Bellardiella 165 

 Bifldaria 101, 102, 104 

 Borsonia 158, 161 

 Bothriocidaris 9, 10, 14, 15 

 Buccinum 164 



Candelabrum 138 



Chauventia 164 



Cidaris 52, 55, 59, 61, 62, 67-71 



Cidarites 52, 55, 63, 64 



Clathurella 160, 165 



Clavatula 129, 152 



Clavus 159, 160 



C'inura 138, 139 



Cochlespira 133, 138, 139, 143, 144 



Cochlespirella 138, 144 



Cochlespiropsis n. gen. 138, 143, 



144 

 Cochlicopa 101-103 

 Cordiera 158, 161 

 Crassispira 159 

 Cymatosyrinx 159 

 Cystocidaris 13 

 Cythara 165, 166 



Daphnella 165, 166 

 Discocystis 11, 73 

 Dolichotoma 147 

 Donovania 124, 163, 164 

 Drillia 144, 153, 158, 159 



Echinocrinus 31, 45, 52, 53, 55, 58- 



63, 69, 70 

 EchiiitK-jsiis 9, 10, 12-14 

 Echinodiscus 11, 73, 74 

 Echinus 59, 71 

 Endiatonia 149 

 Eocidaris 7, 11, 55, 67-72 

 Eoclathurella 160 

 Eodrillia n. gen. 159 

 Eopleurotoma 127, 158 

 Eo^urcula n. gen. 138, 145-147 

 Eotiaris 11, 74 

 Epa'xis 158 

 Eucheilodon 138-140 

 Eucithara 166 



Euclathureila n. gen. 166, 167 

 Euconulus 101, 102, 105 

 Eucyclotoma 165 



Florestita 173, 174 

 Folinaea 164 



Fusitoma n. gen. 161, 163 

 Fusus 156, 161, 163 



Genmula 127, 133-137, 139, 144, 151 



Genota 129 



Glyptotoma n. gen. 138-141, 165 



Halia 123 



Helenella n. gen. 167, 168 

 Helicodiscus 102, 104 

 Hemipleurotoraa 127, 133 

 Hemisurcula n. gen. 150 

 Homotoechus 18, 19 

 Hybochinus 24, 26 



Koniuckocidiris 11, 74 



Lachesis 124, 163, 164 

 Lampsilis 103 

 Lepidechinus 9, 11, 20-22 

 Lepidesthes 11, 24-27 



