6 



CONTENTS. 



Order BOTHRIOCIDAROIDA Jackson . . 238 



Family BOTHRIOCIDARIDAE Klem . . . 238 



Bothriocidaris Eichwald .... 238 



B. archaica sp. nov. . . . 239 



B. pahleni Schmidt 242 



B. globulu* Eichwald. Genotype . . 243 



Order CIDAROIDA Duncan .... 244 



Family CIDARIDAE Gray .... 245 



Miocidaris Doderlein .... 245 



M. kei/Ktrlingi (Gcinitz) .... 245 



M. cannoni sp. nov. .... 247 



Order ECHINOCYSTOIDA nom. nov. . . 250 



Family PALAEODISCIDAE Gregory . . . 250 



Palaeodiscus Salter 250 



P. ferox Salter. Genotype . . .250 



Family ECHINOCYSTIDAE Gregory . . . 252 



Echinocystites Wyville Thomson . . 252 



E. pomum Wyville Thomson. Genotype 252 



Order PERISCHOECHINOIDA M 'Coy . . 253 



Family ARCHAEOCIDARIDAE M 'Coy . . 254 



Eocidaris Desor 254 



E. laevispina (Sandberger). Genotype . 255 



Archaeocidaris M'Coy . . . .256 



A. wortheni Ha\\ 259 



A. legrandensis Miller and Gurley . . 260 

 A. longispina Newberry . . . .261 



A. glabrispina (Phillips) .... 261 



A. nerei (Mtinster) 262 



A. rossica (Buch) 263 



A. agassizi Hall ..'... 266 



A. illinoisensis Worthen and Miller . . 266 



A. coloradensis nom. nov. . . . 267 



A.keokukHfdl 267 



A. gracilis Newberry .... 267 



A. aculeaia Shumard and Swallow . . 268 



A. shumardana Hall .... 268 



A. edgarensis Worthen and Miller . . 269 



A. newberryi Hambach .... 269 



A. trudifer White 269 



A. norwoodi Hall 270 



A. paradoxa (Eichwald) .... 270 



A. mucronala Meek and Worthen . . 271 



A. dininnii White 271 



A.crofwWhite 272 



A . acanthifera Trautschold . . . 272 



A. pizzulana Gortani .... 272 



A. megastyla Shumard and Swallow . . 273 



A. biangidala Shumard and Swallow . 273 



A. ornate (Eichwald) .... 274 



A. ourayensis Girty .... 274 



A. triplex White 274 



A.trisenalis (M'Coy) .... 275 



.4. triserrala Meek 275 



A. rankini Young ..... 276 



A. prisca (Minister) 276 



A. wervekvi Tornquist .... 276 



.1. urii : (Fleming). Genotype . . 276 



A. haUiana (Geinitz) . . . . 279 



A. muensteriana (Koninck) . . . 280 



A. forbesiana (Koninck) .... 280 



A. spinoclavala Worthrn and Miller . 281 



A. sp. b. Girty 281 



.4. clamla (Eichwald) .... 282 



Lepidocidaris Meek and Worthen . . 282 

 L. squamosa Meek and Worthen. Geno- 

 type 282 



Family LEPIDOCENTRIDAE Lovcn . . . 284 



Koninckocidaris Dollo and Buisscrct . 284 

 A', cotteaui Dollo and Buisseret. Geno- 

 type 285 



K. silurica sp. nov 285 



Lepidocentrus Miiller .... 286 



L. rhenanus (Beyrich) .... 288 



L. drydenensis (Vanuxem) . . . 288 



L. mMleri Schultze 289 



L. whitfieldi sp. nov. .... 290 



L. eifelianus Mtiller. Genotype . . 291 



Tornquistellus Berg . . . 291 



T. gracilis (Tornquist). Genotype . 291 



Hyattechinus gen. nov 291 



E. rarispinus (Hall) .... 292 



H. penlagonm sp. nov 295 



H. beecheri sp. nov. Genotype . . 297 



Pholidechinus gen. nov 299 



P. brauni sp. nov. Genotype . . 299 



Family PALAEECHINIDAE M'Coy . . . 302 



Palaeechinus M 'Coy . . . .304 



P. quadriserialis Wright .... 305 



P. ellipticus M 'Coy. Genotype . . 307 



P. elegans M "Coy 308 



P. (?) minor sp. nov. 



Maccoya Pomol 311 



M. burlingtonensis (Meek and Worth) . 312 



M. intermedia (Keeping) .... 314 



M. phillipsiae (Forbes) .... 316 

 M.sphaerica (M'Coy) . . . .317 



M. gigas (M'Coy). Genotype . - 321 



M. gracilis (Meek and Worthen) . . 323 



Lovenechinus gen. nov 324 



L. lacazei (Julien) 326 



