L. iowensis sp. nov. 



L. tessellatus .sp. nov. 



L. imbrioiins Hall. Genotype 

 Perischodomus M 'Coy 



P. biserialis M 'Coy. Genotype 



/■*. itiuKiiscnsis Worthen and Miller 

 Perischocidaris Xeunia>i' 



P. harteiana (Baily). Genotype 

 Proterocidaris Koniiuk 



/'. i/ii/iinlcii.-i Koninck. Genotype 

 Lepidesthes Meek and Worthen 



L. u'orlheni Jackson . 



L. laens Trautschold 



L. formosa Miller 



L. devonicans Whidborne . 



L. spectabilis (Worthen and Miller) 



L. coreyi Meek and Worthen. Genotype 



L. carinaia sp. nov. .... 



L. colleUi White .... 



L. extremis sp. nov. .... 



h. caledonica sp. no\'. 

 Pholidocidaris Meek and Worthen 



P. intgiilari.s (Meek and Worthen) 

 Genotype 



P. sp 



P. tenuis Tomquist . 



P. ncauria (Whidborne) . 



/'. gnuiln/i (Julien) . 

 Meekechinus gen. no\-. 



M . elegans sp. no\'. Genotype 



397 

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 401 

 401 

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 418 

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434 

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 443 



Incertae Sedis .... 

 Archaeocidaris konincki Desor 

 A. ladina Stache 

 A. scotica Young 

 A. selwyni R. Etheridgc, Jr. 

 A. sin Barrois 

 A. Iraulscholdi Tornfiuist 

 A. sp. Meek and Hayden 

 A. sp. Meek and Hayden 

 A. sp. Stache . 

 A. (?) sp. Worthen and Miller 

 A. sp. R. Etheridge, Jr. . 

 A. sp. Julien 

 A. sp. Julien 

 A. sp. Julien 



Cidarites tennesseae Troost 

 Echinocrinus anceps T. and T. Austin 

 E. spinosus T. and T. Austin . 



440 

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 449 



E. slriiilus Eichwald 

 E. sp. Austin 

 Melonitiden Tomquist 

 Oligoporus (?) minutus Beede 

 Palaechinus (?) konigii M 'Coy 

 Palaeechinus regnyi nom. nov. 

 Palaechinus rnbineti Julien 

 Palechinus sp. Tomquist . 

 Palaeocidaris exilis Eichwald 

 Palaeodiscus gothicus Wyville Thoni; 

 Palaeospatangus skiptoni Harte 

 Perischodomus magnus Tomquist 

 Protoechinus T. Austin 



P. ancips T. Austin. Genotype 

 Rhoechinus sp. Duncan 

 Rhoechinus (?) sp. Tomquist . 



440 

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 4.54 

 454 

 454 



