18 



CHESTER OSTRACODES OF ILLINOIS 



Species 



C 



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c 

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o 



o 



c 



a 



Q 



c 



c 



El 



> 



<u 



o 









6 



Amr>hi<;«;lfp<? lafinodus Croneis and Bristol 



X 



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cf. 



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? 



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cf. 



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A rnr>hicci f(=Q nnarlratiis C-OODpr 









3,4 



A mnViiccif PI qiitidIpv fCrirtVI 



4 



Balantoides moreyl Croneis and Funkhouser 



RTlanfoirles auadrilobus Morev 



7 



Balantoides reticulatus Croneis and Thurman 



T^iQmidplla amnla Coonpr 















Ectodemites bicarinatus (Croneis and Thurman) .... 



Ectodemites costelliferus (Croneis and Bristol) 



Frtodemites elono'atus CooDer 



— 



Ectodemites masnireticulatus Cooper 







Ectodemites monomastadis (Coryell and Sohn) 



Ectodemites obesus (Croneis and Gale) 



6 



Frtodemites obloneus (Tones and Kirkbv) 



8 



Frtodemites oblonsfus transversalis (Girtv) 



3 



























7 









7 



Kirkbya aequalis Croneis and Funkhouser 











Kirkbya elongata Cooper 













Kirkbya humerosa Cooper 







Kirkbya intermedia Croneis and Thurman. 







Kirkbya marginata Croneis and Funkhouser 



Kirkbya cf. reflexa Girty 



3 



Kirkbya regularia Croneis and Gale 





Kirkbya symmetrica Croneis and Thurman 







Kirkbya turrita Croneis and Gale . . 







Kirkbyella gutkei Croneis and Bristol . . 





Kirkbyella quadrata Croneis and Gutke . . 





Kirkbyella sulcata Cooper 







Kirkbyella truncata Cooper 







Polytylites ambitus Cooper 





Polytylites biforatus (Croneis and Thurman) 



Polytylites bradfieldi (Croneis and Funkhouser) 



Polytylites concavus (Croneis and Bristol) . . 



— 



Polytylites crassus Cooper 







Polytylites directus Cooper 







Polytylites diversus Cooper .... . 







Polytylites elongatus (Croneis and Bristol) 







Polytylites fossilis (Croneis and Thurman) 



, 



Polytylites geniculatus Cooper . . 







Polytylites grovei (Croneis and Gutke) 







Polytylites nodobliquus (Croneis and Gale) 







Polytylites quincollinus (Harlton) 



3 



Polytylites reticulatus Cooper . . 





Polytylites similis (Croneis and Gale) 











